scholarly journals APLIKASI PUPUK DAN MULSA JERAMI PADA TANAMAN KEDELAI TERHADAP SERANGAN HAMA DAN PRODUKSI

EUGENIA ◽  
2015 ◽  
Vol 21 (1) ◽  
Author(s):  
J. Rimbing ◽  
J. Pelealu ◽  
D. Sualang
Keyword(s):  
Insect Pests ◽  
Block Design ◽  
Insect Pest ◽  
Inorganic Fertilizer ◽  
Flying Insects ◽  
Randomized Block Design ◽  
Soybean Pest ◽  
Crop Damages ◽  
Virus Attack ◽  
Soybean Plants

ABSTRACT   The research was arranged in a randomized block design (RBD), with 10 treatments and 3 replications. To get the active insects pests, net sweepings were done for the flying insects, while other pests were observed directly on the plants. Collecting data of plant damages were made by systematic diagonal lines, except for viruses, census was conducted on each experimental plot.  The results of this experiment documented 12 species of insect pests attacking soybean plants. Soybean pest populations were relatively low, except for Aphis glycine that was quite high. In all treatments, plant damage caused by sucking pest Piezodorus sp and Riptortus linearis were relatively low of 1.53 % to 1.94 %; it indicated an insignificant effect to decline the production. Crop damages by virus showed a significant effect. The lowest virus attacks found on compost of 5 tons per ha with 43 plants infected per treatment, the highest virus attack showed on combination of 5 tons compost per ha + inorganic fertilizer + mulch, in which there were 274 infected plants per treatment. Apparently virus attacks gave impact on soybean production. The highest production were documented on treatment of 5 tons compost per ha with production of 0.55 tons per ha, while the lowest production was found on combination of 5 tons compost per ha + inorganic fertilizer + mulch, in which the production was 0.22 tons per ha. Keywords:  fertilizer, mulch, insect pest, production

scholarly journals Screening of Genotypes against Major Sucking Insect- Pests of Mothbean [Vigna aconitifolia] in Arid Region

2021 ◽  
pp. 80-88
Author(s):  
K. L. Naga ◽  
A. R. Naqvi ◽  
B. L. Naga ◽  
H. L. Deshwal ◽  
L. Jhumar
Keyword(s):  
Integrated Pest Management ◽  
Pest Management ◽  
Arid Region ◽  
Insect Pests ◽  
Block Design ◽  
Insect Pest ◽  
Management Programme ◽  
Natural Resistance ◽  
Vigna Aconitifolia ◽  
Randomized Block Design

Aim: Some genotypes of mothbean were screened for their comparative preference against jassids, whiteflies and thrips. Materials and Methods: The experiment was laid out during Kharif season in Randomized Block Design with three Replications. Ten genotypes (viz., RMO-225, RMO-40, RMO-423, RMO-435, RMO-257, RMO-25, RMO-141, RMO-20-36, RMO-04-01-28 and RMO-28-80) were screened against major sucking insect pests which were replicated thrice. Observations: The observations were recorded after two weeks of sowing at weekly intervals after two weeks of sowing. The pest populations were recorded on five randomly selected and tagged plants per plot in early hours when insect have minimum activity. Results: The data revealed that none of the genotypes ware found free from sucking insect pest attack. On the basis of peak population, the genotypes RMO-25 and RMO-141 were categorized as least preferred to jassids, whiteflies and thrips, whereas, RMO-435, RMO-225 and RMO-04-01-28 as highly preferred to jassids and whiteflies and RMO-435, RMO-225 and RMO-257 as highly resistant to thrips. Conclusion: It is well known that certain genotypes of crops are less attacked by a specific insect-pest than others because of natural resistance. In the integrated pest management programme, growing of varieties (RMO-25 and RMO-141) with less preference to sucking insect-pests is one of the most important tools without additional cost.

scholarly journals Morphological and Biochemical Bases of Resistance of Some Groundnut Germplasms against Tobacco Caterpillar, Spodoptera litura (Fabricius) and Leaf Miner, Aproaerema modicella (Deventer)

2021 ◽  
pp. 195-204
Author(s):  
Shaik Moizur Rahman ◽  
K Vijayalakshmi ◽  
Ch. V. Durga Rani ◽  
S. Ameer Basha ◽  
C. Srinivas
Keyword(s):  
Insect Pests ◽  
Block Design ◽  
Insect Pest ◽  
Leaf Damage ◽  
Leaf Miner ◽  
College Of Agriculture ◽  
Pest Damage ◽  
Randomized Block Design ◽  
Germplasm Line ◽  
Tobacco Caterpillar

A screening experiment of forty germplasm lines was conducted at College Farm, College of Agriculture, Rajendranagar, Hyderabad in rabi, 2019-20 and was laid in Randomized block design (RBD) having two replicates. Three germplasm lines viz., ICGV 16679 (13.71% leaf damage), ICGV 07222 (14.00% leaf damage) and ICGV 93468 (14.25% leaf damage) showed greater resistance than the resistant check, ICGV 86031 (15.04% leaf damage) against tobacco caterpillar and with respect to resistance against leaf miner, no germplasm line was found to be superior than the resistant check, ICGV 86031 (7.82% leaf damage). However, the germplasm line, ICGV 02266 (8.35% leaf damage) was next best to the resistant check. The various morphological and biochemical characters were recorded and correlated with insect pest damage and incidence to know their role in imparting resistance/susceptibility. Resistance to various insect pests in germplasm lines was due to significantly higher trichome density on leaf lamina, higher phenol and tannin content.

​Effects of Genotypic Diversity on Insect-pests of Soybean

2021 ◽  
Author(s):  
Lokesh Kumar Meena ◽  
Vangala Rajesh ◽  
Amar Nath Sharma
Keyword(s):  
Effective Treatment ◽  
Natural Enemy ◽  
Agronomic Traits ◽  
Insect Pests ◽  
Block Design ◽  
Insect Pest ◽  
Genotypic Diversity ◽  
Intraspecific Diversity ◽  
Small Scale ◽  
Randomized Block Design

Background: Intercropping and mixed cropping based on two or more different crops have been widely used in Insect Pest Management to manage the population density of insect pests in various crops like maize with soybean, sorghum with soybean and sunflower with soybean. Genotypic diversity is the mixture or combination of various varieties/lines/genotypes of a crop. It decreases the insect-pests population by unfitness of crop to them due to intraspecific diversity such as mixture of susceptible and resistant varieties. Also, it increases the natural enemy population more due to longer period of flowering, availability of wide diverse food, more movement of herbivores etc. This concept has also been used successfully to manage insect-pests in maize, wheat and potato. In India, this connect is used in very small scale in crop. The objective of this study was to determine effects of genotypic diversity by comparing the population densities of major insect pests between monoculture of single variety and mixture of varieties. Methods: To test the effects of genotypic diversity on soybean insect-pest and their natural enemy population an experiment was laid in kharif 2018 and 2019 at the ICAR-Indian Institute of Soybean Research, Indore. All recommended agronomic package of practices were followed for raising of crop. Randomized block design with three replication having plot size of 9 rows of 5 meter row length was used. Totally 20 treatments were chosen for this experiment and out of 20 four treatments namely, T1, T6, T11 and T16 were the treatments of four varietal mixture treatments of almost similar maturity duration and agronomic traits and rest of treatments were of sole varietal treatments. Observations were made on insect-pests from 10 selected plants in each plot on three leaves selected at top, middle and lower portion of plant. Result: Effects of genotypic diversity in soybean revealed that for whitefly management T11 (NRC-86, JS-335, JS-2098 and RKS-45) was found most effective treatment. In case of mite, thrips and treehoppers management T1 (JS-9560, JS-20-34, MAUS-47 and MAUS-1460) was found most effective treatment. For leafhopper and mealy bug T6 (JS-9305, JS-2029, RVS-2001-4 and Dsb-28-3) was found most effective treatment. While for spittlebug T16 (NRC-37, JS-9752, RSC-1046 and RKS-113) was found most effective treatment. So, genotypic diverse treatments were found more effective than their respective sole varietal treatments.

scholarly journals Quantification of Avoidable Yield Losses in Oilseed Brassica Caused by Insect Pests

2011 ◽  
Vol 51 (1) ◽  
pp. 38-43 ◽  
Author(s):  
Jagdev Kular ◽  
Sarwan Kumar
Keyword(s):  
Seed Yield ◽  
Yield Loss ◽  
Insect Pests ◽  
Block Design ◽  
Maximum Yield ◽  
The Other ◽  
Yield Losses ◽  
Eruca Sativa ◽  
Mustard Aphid ◽  
Randomized Block Design

Quantification of Avoidable Yield Losses in OilseedBrassicaCaused by Insect PestsA six year field study was conducted from 2001-2002 to 2006-2007 at Punjab Agricultural University, Ludhiana, India to study the losses in seed yield of differentBrassicaspecies (B. juncea, B. napus, B. carinata, B. rapaandEruca sativa) by the infestation of insect pests. The experiment was conducted in two different sets viz. protected/sprayed and unprotected, in a randomized block design, with three replications. Data on the infestation of insect pests, and seed yield were recorded at weekly intervals and at harvest, respectively. The loss in seed yield, due to mustard aphid and cabbage caterpillar, varied from 6.5 to 26.4 per cent.E. sativasuffered the least loss in seed yield and harboured the minimum population of mustard aphid (2.1 aphids/plant) and cabbage caterpillar (2.4 larvae/plant). On the other hand,B. carinatawas highly susceptible to the cabbage caterpillar (26.2 larvae/plant) and suffered the maximum yield loss (26.4%).

scholarly journals Peran Pupuk Organik dalam Peningkatan Efisiensi Pupuk Anorganik pada Padi Sawah (Oryza sativa L.)

2015 ◽  
Vol 43 (1) ◽  
pp. 8
Author(s):  
Totong Siwanto ◽  
Sugiyanta , ◽  
Maya Melati
Keyword(s):  
Oryza Sativa L ◽  
Block Design ◽  
Organic Fertilizer ◽  
Biological Properties ◽  
Paddy Rice ◽  
Inorganic Fertilizer ◽  
Growth And Yield ◽  
Research Station ◽  
Randomized Block Design ◽  
Two Factors

ABSTRACT<br />Application of organic fertilizer into the soil is designated as a source of macro, micro nutrients and organic acids; it also acts as soil ameliorant that improve physical, chemical and biological properties of soil. Application of high rates organic fertilizer has a constraint namely the availability and ease of application. Therefore, it is necessary to learn the use of organic fertilizer with low rates to improve the efficiency of chemical fertilizers. This research was aimed to study the effect of organic and inorganic fertilizers on growth and yield of paddy rice, as well as the efficiency of N, P, K inorganic fertilizer. Field experiment was conducted at Sawah Baru Research Station, University Farm IPB, Bogor, West Java from September to December 2013. The experiment used Randomized Block Design consisted of two factors: rates of organic fertilizer (0, 250, 500, 750, and 1,000 kg ha-1), and rates of inorganic fertilizer (0, 100, 200, 300, and 400 kg ha-1). The results suggested that the application of 1,000 kg organic fertilizer ha-1 + 400 kg inorganic fertilizer ha-1 did not show significant interaction. Application of organic fertilizer alone up to 1,000 kg ha-1 resulted in low growth and yield. Increasing rates of  application up to 400 kg inorganic fertilizer ha-1 increased the growth and yield of paddy rice. The highest N efficiency was 89.19% at a rate of 500 kg organic fertilizer ha-1 + 200 kg inorganic fertilizer ha-1, whereas the highest efficiency of P and K, respectively were 69.55% and 92.52% at a rate of 750 kg organic fertilizer ha-1 + 300 kg inorganic fertilizer ha-1.<br />Keywords: NPK, organic fertilizer, paddy rice

scholarly journals Control of Conyza spp. with sequential application of glufosinate in soybean pre-sowing

2020 ◽  
Vol 50 (9) ◽  
Author(s):  
Alfredo Junior Paiola Albrecht ◽  
Leandro Paiola Albrecht ◽  
André Felipe Moreira Silva ◽  
Romulo Augusto Ramos ◽  
Natália Buttini Corrêa ◽  
...  
Keyword(s):  
Plant Height ◽  
Seed Production ◽  
Management System ◽  
Block Design ◽  
Agronomic Performance ◽  
General Control ◽  
Crop Injury ◽  
Randomized Block Design ◽  
Soybean Plants

ABSTRACT: Conyza spp. is among the main weeds reported worldwide. Due to its aggressiveness, such as high seed production and dispersion, and the growing reports of biotypes resistant to glyphosate, paraquat, and other herbicides, different control practices are required. Thus, this study aimed to evaluate the efficacy of herbicides with sequential application of glufosinate in soybean pre-sowing for control of Conyza spp. with indicative of resistant to paraquat. The study was carried out in the field, at Assis Chateaubriand and Palotina, state of Paraná, Brazil, in the 2018/19 season. The experiments were conducted in a randomized block design with four replications. The treatments consisted in application of glyphosate, 2,4-D, saflufenacil, glufosinate, saflufenacil/imazethapyr, diclosulam, paraquat/diuron, paraquat and imazethapyr/flumioxazin, at different combinations, in soybean pre-sowing. Control of Conyza spp., crop injury to soybean plants and variables related to agronomic performance (plant height and yield) were evaluated. All treatments were selective for soybean, which showed stronger crop injury in the presence of diclosulam herbicide, but this did not compromise soybean agronomic performance. In general, control levels were high for the treatments used. Except for paraquat treatments, in the area with the highest frequency of Conyza spp. with indicative of resistant to paraquat, and imazethapyr/flumioxazin treatment in both areas. These control results emphasized the importance of glufosinate in this management system and showed promising results for saflufenacil/imazethapyr.

scholarly journals Action of auxin inhibitors on growth and grain yield of soybean

Revista CERES ◽  
2013 ◽  
Vol 60 (5) ◽  
pp. 621-628 ◽  
Author(s):  
Gederson Luiz Buzzello ◽  
Michelangelo Muzell Trezzi ◽  
José Abramo Marchese ◽  
Elouize Xavier ◽  
Edemir Miotto Junior ◽  
...  
Keyword(s):  
Grain Yield ◽  
Plant Height ◽  
Negative Correlation ◽  
Block Design ◽  
Sowing Date ◽  
Growth And Yield ◽  
Fertility Level ◽  
Randomized Block Design ◽  
Soybean Genotypes ◽  
Soybean Plants

Soybean genotypes grown in sub-tropical climate may exhibit lodging. The plant lodging is influenced by soil type and fertility level, sowing date, latitude and altitude of the location, plant population and conditions of crop development. Plant regulators and herbicides are able to avoid or reduce plant lodging. This study aimed to verify the effects of the growth regulators TIBA and daminozide on vegetative growth and yield of soybean cultivar CD 214 RR. The experiment was carried out at a field in randomized block design with four replications in a factorial scheme. The A factor was represented by the combination of regulators TIBA and daminozide and its concentrations, and the Factor B was seven times of evaluation of injury and plant height or eight times of evaluation of lodging. In the range of doses used, the application of daminozide resulted in greater injury to soybean plants than TIBA. The smaller plant height was achieved by the application of 6 g ha-1 of TIBA and 1200 g ha-¹ of daminozide. Treatments with daminozide (100 g ha-¹) and TIBA (10 g ha-1) stood out due to the reduced lodging of soybean plants. Grain weight increased linearly when the levels of TIBA increased. There was a negative correlation between lodging and grain yield and a positive correlation between plant height and lodging. There was also a negative correlation between injury caused by the application of plant regulators and lodging.

scholarly journals KETAHANAN BEBERAPA AKSESI KAPAS TERHADAP HAMA PENGISAP DAUN Amrasca biguttula (ISHIDA)

2020 ◽  
Vol 13 (3) ◽  
pp. 81
Author(s):  
I G.A.A. INDRAYANI ◽  
SIWI SUMARTINI ◽  
B. HELIYANTO B. HELIYANTO
Keyword(s):  
Gossypium Hirsutum ◽  
Chemical Control ◽  
Block Design ◽  
Insect Pest ◽  
Resistant Variety ◽  
Plant Spacing ◽  
Experimental Station ◽  
Randomized Block Design ◽  
Mental Problems ◽  
Moderately Resistant

ABSTRAK<br />Amrasca biguttula (Ishida) adalah serangga hama pengisap daun<br />yang sangat potensial menurunkan produktivitas kapas. Pengendaliannya<br />secara kimiawi menimbulkan banyak masalah lingkungan, seperti<br />pencemaran dan peningkatan resistensi hama terhadap insektisida kimia<br />sintetis. Salah satu solusi dalam masalah tersebut adalah penggunaan<br />varietas tahan (resisten) yang juga merupakan bagian dari pengendalian<br />hama terpadu (PHT) pada kapas. Penelitian ketahanan beberapa aksesi<br />kapas terhadap A. biguttula (Ishida) dilakukan di Kebun Percobaan Balai<br />Penelitian Tanaman Tembakau dan Serat di Asembagus, Situbondo, mulai<br />Januari hingga Desember 2006. Tujuannya adalah untuk mengetahui<br />ketahanan beberapa aksesi kapas terhadap serangan hama pengisap daun,<br />A. biguttula. Sebagai perlakuan adalah 30 aksesi kapas yang ditanam<br />dalam plot berukuran 10 m x 3 m, dengan jarak tanam 100 cm x 25 cm,<br />satu tanaman per lobang. Setiap aksesi disusun dalam rancangan acak<br />kelompok dengan tiga kali ulangan. Parameter yang diamati adalah jumlah<br />nimfa A. biguttula per daun, jumlah bulu daun per cm 2 luas daun, dan<br />posisi bulu terhadap lamina (tegak/rebah), serta skor kerusakan tanaman.<br />Hasil penelitian menunjukkan bahwa setiap aksesi kapas berpotensi<br />terserang A. biguttula, meskipun tingkat populasi hama ini tidak<br />menunjukkan perbedaan nyata antar aksesi. Terjadi korelasi negatif (R 2 =<br />0,2425) antara jumlah bulu daun dan populasi nimfa A. biguttula dan<br />antara jumlah bulu daun dan skor kerusakan tanaman (R 2 = 0,2027).<br />Berdasarkan jumlah bulu daun, aksesi kapas yang termasuk kategori<br />sedikit berbulu dengan kriteria ketahanan sedikit tahan adalah: AC 134,<br />Stoneville 7, Fai Nai, SHR, CRDI-1, Kanesia 5, Kanesia 8, dan Kanesia 9.<br />Sedangkan aksesi lainnya termasuk kategori tidak berbulu dan peka<br />terhadap serangan A. biguttula.<br />Kata kunci : Kapas, Gossypium hirsutum, aksesi, hama, Amrasca<br />biguttula (Ishida), toleran, peka, kerusakan, Jawa Timur<br />ABSTRACT<br />Resistance of several cotton accessions to sucking insect<br />pest, Amrasca biguttula (Ishida)<br />Amrasca biguttula (Ishida) is a sucking insect pest which potentially<br />reduces cotton productivity. Its chemical control often cause environ-<br />mental problems mainly air pollution and increase of pest resistance to<br />certain chemical insecticides. One solution can be used to solve these<br />problems is by using resistant variety that is also an integral part of the<br />integrated pest management (IPM). Study on the resistance of several<br />cotton accessions to sucking insect pest, Amrasca biguttula (Ishida) was<br />conducted at the Experimental Station of the Indonesian Tobacco and<br />Fiber Crops Research Institute (IToFCRI) in Asembagus, Situbondo, East<br />Java, from January to December 2006. The objective of the study was to<br />find out the resistance of cotton accessions to sucking insect pest. Thirty<br />accessions of cotton were used as treatment and were planted in plots 10 m<br />x 3 m with plant spacing 100 cm x 25 cm, one plant per hole. Each<br />accession was arranged in a randomized block design with three<br />replications. Parameters observed were number of nymph of A. biguttula,<br />number of leaf hair, leaf hairs position (erect or lie down), and score of<br />damage. The result showed that every accession of cotton can be attacked<br />by A. biguttula although the insect population was not significantly<br />different among accessions. There is negative correlation (R 2 = 0.2425)<br />between number of leaf hair and population of A. biguttula and between<br />number of leaf hair and score of plant damage (R 2 = 0.2027). Accessions<br />that categorized as lightly hairy and moderately resistant to A. biguttula<br />were AC 134, Stoneville 7, Fai Nai, SHR, CRDI-1, Kanesia 5, Kanesia 8,<br />and Kanesia 9, while the others were categorized as glabrous and<br />susceptible to the sucking pest.<br />Key words: Cotton, Gossypium hirsutum, accession, insect pest, Amrasca<br />biguttula (Ishida), tolerant, sensitive, damage, East Jav

scholarly journals PENGARUH UKURAN BRAKTEA BEBERAPA AKSESI KAPAS TERHADAP TINGKAT SERANGAN HAMA PENGGEREK BUAH Helicoverpa armigera (HUBNER)

2020 ◽  
Vol 13 (4) ◽  
pp. 125
Author(s):  
IG.A.A. INDRAYANI ◽  
SIWI SUMARTINI
Keyword(s):  
Helicoverpa Armigera ◽  
Morphological Character ◽  
Insect Pests ◽  
Block Design ◽  
Morphological Characters ◽  
Floral Bract ◽  
Randomized Block Design ◽  
Cotton Plants ◽  
American Bollworm ◽  
Helicoverpa Armígera

<p>ABSTRAK<br />Hingga kini teknik perakitan varietas kapas tahan hama masih<br />dilakukan secara konvensional berdasarkan beberapa karakter morfologi<br />tanaman, seperti: bulu daun, daun okra, braktea berpilin, nektar, dan<br />gosipol tinggi. Karakter-karakter ini diketahui erat hubungannya dengan<br />ketahanan terhadap hama, khususnya H. armigera. Berkaitan dengan<br />serangan H. armigera pada buah, diduga ada bagian-bagian buah kapas<br />yang berkontribusi secara langsung pada serangan hama ini, misalnya<br />braktea buah. Namun demikian, besarnya pengaruh braktea terhadap<br />kerusakan buah kapas perlu dipelajari dalam upaya meminimalkan<br />kerusakan. Penelitian ini bertujuan untuk mengetahui pengaruh ukuran<br />braktea terhadap tingkat kerusakan buah oleh H. armigera pada beberapa<br />aksesi kapas. Penelitian dilaksanakan di Kebun Percobaan Balai Penelitian<br />Tanaman Tembakau dan Serat, di Asembagus, Situbondo, Jawa Timur<br />mulai bulan Januari hingga Desember 2006. Sebanyak 18 aksesi dari 50<br />aksesi kapas dengan berbagai variasi ukuran braktea digunakan sebagai<br />perlakuan. Setiap perlakuan (aksesi) disusun dalam rancangan acak<br />kelompok (RAK), dengan tiga kali ulangan. Lima tanaman kapas dari<br />masing-masing aksesi ditentukan secara acak, dan sebanyak 5 buah kapas<br />muda (diameter ± 4 cm) dipetik dari masing-masing tanaman sampel,<br />kemudian dibawa ke laboratorium untuk diukur luas braktea dan buahnya.<br />Selain itu dilakukan pula pengamatan kerusakan buah dan hasil kapas<br />berbiji di lapang. Hasil penelitian menunjukkan bahwa ukuran braktea<br />berkorelasi positif dengan tingkat kerusakan buah (R 2 = 0,9014), sehingga<br />braktea berukuran besar dan lebar serta menutupi buah secara total<br />berpotensi mengalami kerusakan akibat serangan H. armigera lebih tinggi<br />dibanding braktea berukuran kecil dan sempit. Ukuran panjang dan lebar<br />braktea pada 18 aksesi kapas bervariasi antar aksesi dan masing-masing<br />berkorelasi positif dengan luas (R 2 = 0,876; R 2 = 0,894). Hasil penelitian<br />ini dapat dimanfaatkan dalam merakit varietas tahan hama, dan<br />kombinasinya dengan karakter-karakter morfologi kapas yang sudah ada<br />untuk menghasilkan varietas kapas baru dengan tingkat ketahanan yang<br />lebih tinggi terhadap hama penggerek buah H. armigera.<br />Katakunci : Braktea, Helicoverpa armigera, aksesi kapas, karakter<br />morfologi.</p><p><br />ABSTRACT<br />Effects of bract size of several cotton accessions to<br />American bollworm injury level<br />Conventional  method  by  crossing  technique  based  on<br />morphological characters of plant is now still used in providing resistant<br />varieties of cotton against insect bollworms. A number of genetic<br />characters are now available and have been studying for their assosiation<br />with insect pests resistance such as hairiness, okra leaf, frego bract,<br />nectariless, and high gossypol. Regarding to boll damage by H. armigera,<br />it can be mentioned that there are many other morphological characters of<br />cotton attributable to bollworm damage, such as floral bract. As a part of<br />boll, it is estimated that bracts assosiated with bollworm attacked due to<br />their larger size compared with boll size. Objective of the study was to find<br />out the effect of bract size in relation to bollworm damage on cotton<br />accessions. The study was conducted at Experimental Station of<br />Indonesian Tobacco and Fiber Crops Research Institute in Asembagus,<br />Situbondo, East Java from January to December 2006. Eighteen of fifty<br />cotton accessions were used as treatment and they were arranged in<br />Randomized Block Design (RBD) with three replications. Five randomly<br />cotton plants from each accession and five young bolls were sampled<br />from the selected plant with about 4 cm of diameter were brought in the<br />laboratory to collect information on bract and boll sizes. Bollworm<br />damage was determined by counting the damaged bolls in the field as well<br />as the seed cotton yield. Result showed that bract size was positively<br />correlated with boll damage (R 2 = 0.9014). Higher damaged bolls occured<br />on bolls which is covered completely by bracts. There is variation between<br />length and wide size of bracts among cotton accessions and both showed<br />positive correlation to bract area (R 2 = 0.876; R 2 = 0.894). Based on this<br />study, higher resistance of cotton variety against H. armigera will<br />possiblly be provided through combination between bract size and any<br />other morphological characters of cotton.<br />Key words : Floral bract, Helicoverpa armigera, cotton accession,<br />morphological character</p>

scholarly journals Effectiveness of Organonitrofos Plus Fertilizer on Sweet Corn and Soil Chemical Properties of Ultisols

2016 ◽  
Vol 21 (1) ◽  
pp. 9
Author(s):  
. Dermiyati ◽  
Setyo Dwi Utomo ◽  
Kuswanta Futas Hidayat ◽  
Jamalam Lumbanraja ◽  
Sugeng Triyono ◽  
...  
Keyword(s):  
Zea Mays ◽  
Sweet Corn ◽  
Block Design ◽  
Chemical Properties ◽  
Inorganic Fertilizer ◽  
Soil Chemical Properties ◽  
Corn Production ◽  
Inorganic Fertilizers ◽  
Randomized Block Design ◽  
The Difference

This study aimed to examine Organonitrofos Plus fertilizer (OP) on sweet corn (Zea mays Saccharata L.) and its effect on changes in soil chemical properties of Ultisols. Organonitrofos Plus fertilizer is an enhancement of Organonitrofos fertilizer enriched with microbes at the beginning of the manufacturing process. Research was conducted in the greenhouse of Integrated Agricultural Laboratory of Lampung University. Treatment applied was a factorial of 4 × 2 × 3 with three replications in a randomized block design. The first factor was the dose of OP fertilizer (0, 10, 20, 30 Mg ha-1), the second factor was the dose of inorganic fertilizers (without inorganic fertilizers, and with inorganic fertilizers, namely Urea 0.44, 0.28 SP-36 and KCl 0.16 Mg ha-1), and the third factor was the dose of biochar (0, 10, 20 Mg ha-1). By a single OP fertilizers, inorganic fertilizers, and the interaction between the OP and the inorganic fertilizers increased the weight of dry stover, cob length, cob diameter, cob with husk and cob without husk of corn. OP fertilizers which are applied in Ultisols can improve soil fertility and increase corn production so that OP fertilizer can lessen the use of inorganic fertilizer and can be used as a substitute for inorganic fertilizer. RAE values were highest in treatment of O4K2B2 (30 Mg OP ha-1, with inorganic fertilizer, 10 Mg biochar ha-1) that was equal to 181%, followed by O2K2B3 (10 Mg OP ha-1, with inorganic fertilizer, 20 Mg biochar ha-1 ) with the difference in RAE value of 0.5%. [How to Cite: Dermiyati, SD  Utomo,  KF Hidayat, J Lumbanraja, S Triyono, H Ismono, NE  Ratna, NT Putri dan R Taisa. 2016. Pengujian Pupuk Organonitrofos Plus pada Jagung Manis (Zea mays Saccharata. L) dan Perubahan Sifat Kimia Tanah Ultisols. J Trop Soils 21: 9-17 Doi: 10. 10.5400/jts.2016.21.1.9]

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