scholarly journals The productivity and economic value of sweet potato (Ipomea batatas) planted intercropped with satoimo taro (Colocasia esculenta (L.) Schott var. Antiquorum) with various levels of compost

2021 ◽  
Vol 886 (1) ◽  
pp. 012114
Author(s):  
M Syafiuddin ◽  
M Jayadi ◽  
B Rasyid ◽  
N Busthanul
Keyword(s):  
Sweet Potato ◽  
Block Design ◽  
Economic Value ◽  
Dry Weight ◽  
Plant Size ◽  
Colocasia Esculenta ◽  
Sweet Potatoes ◽  
Ipomea Batatas ◽  
Four Levels ◽  
Staple Crop

Abstract Sweetpotato (Ipomea batatas), as a well-known plant and widely cultivated by farmers in South Sulawesi, if it is intercropped with satoimo taro (Colocasia esculenta (L.) Schott var. Antiquorum) as a staple crop should be suspected of being able to be a ‘safety’ crop when there is a failure in taro plant—due to the relatively new and un-well-known plant. The study was aimed to know the productivity and economic value of sweet potato planted as an intercropped on the staple crop satoimo taro plantation with several levels of compost. The study used a randomized complete block design with four levels of manure compost, namely 400 grams, 800 grams, and 1200 grams per staple plant, which put into and mixed evenly in the plant hole, and 1200 grams per staple plant which mixed evenly in the beds, and three blocks. Sweet potatoes were planted between staple plants satoimo that arranged 20 plants in a bed of 500 cm x 110 cm in two rows. The parameters observed were yields of tuber per plant, size of tuber, number of tubers, and dry weight of tops. The results showed that there is no level of compost affected significantly. However, both of the levels of 1200 grams of compost which is filled into the plant hole, and 1200 grams of compost mixed in the beds tended to be higher than the others in tuber productivity. By economic valuations, the RC-ratio and RC-ratio indicated that planting intercropped sweet potato are beneficially in all levels and increased after the levels of compost. Cultivating sweet potato intercropped in the two kinds application of 1200 grams levels in the taro plantation is more recommended.

scholarly journals CAROTENE YIELD IN SWEET POTATO AFTER POTASSIUM AND PHOSPHORUS FERTILISER APPLICATION

2019 ◽  
Vol 32 (3) ◽  
pp. 851-857
Author(s):  
SANDRA MARIA CRUZ NASCIMENTO ◽  
ARTHUR BERNARDES CECÍLIO-FILHO ◽  
ALEXSANDRA SOUZA NASCIMENTO DA SILVA ◽  
PABLO FORLAN VARGAS
Keyword(s):  
Sweet Potato ◽  
Polynomial Regression ◽  
Block Design ◽  
Dry Weight ◽  
Sweet Potatoes ◽  
Total Carotenoids ◽  
Weight Content ◽  
Phosphorus Fertiliser ◽  
Fertiliser Application ◽  
Β Carotene

ABSTRACT Sweet potato is one of the most important foods in the world. Among the different cultivated genotypes, it is worth highlighting those with orange pulp due to their ability to supply adequate amounts of provitamin A carotenoids to humans. This study evaluates the effect of potassium and phosphorus fertiliser application on carotenoid yield in sweet potatoes. Two experiments were carried out in São Luis City, Maranhão State, Brazil. The experimental design was a randomised block design, with six treatments for each of the studies (0, 30, 60, 90, 120 and 150 kg ha-1 K2O and 0, 60, 120, 180, 240 and 300 kg ha-1 P2O5), with four replicates. Cultivar 'Beauregard' was used, which has high levels of carotenoids. Roots were harvested at 123 days after planting for both experiments. The following variables were evaluated: root fresh and dry weight, dry weight content, in addition to the yield and contents of total carotenoids, α-carotene, β-carotene, 13-cis β-carotene and 9-cis β-carotene. With the average data of the evaluated characteristics, we performed analysis of variance and polynomial regression analysis. Potassium rates influenced carotenoid yield in sweet potato roots, with the rates of 73 to 77 kg ha-1 K2O being recommended to maximise the production of total carotenoids, β-carotene, and α-carotene. Phosphorus, in turn, influenced only total carotenoids, and is recommended at the rate of 174.09 kg ha-1 P2O5 to maximise the production of these nutrients.

scholarly journals Respons Pertumbuhan Bibit Kelapa Sawit (Elaeis guineensis Jacq.) terhadap Pemberian Pupuk Organik Asal Pelepah Kelapa Sawit dan Pupuk Majemuk NPK

Agrikultura ◽  
2017 ◽  
Vol 28 (2) ◽  
Author(s):  
Mira Ariyanti ◽  
Gita Natali ◽  
Cucu Suherman
Keyword(s):  
Oil Palm ◽  
Elaeis Guineensis ◽  
Block Design ◽  
Organic Fertilizer ◽  
Dry Weight ◽  
Organic Fertilizers ◽  
Compound Fertilizer ◽  
Elaeis Guineensis Jacq ◽  
Four Levels ◽  
Palm Fronds

ABSTRACTThe growth response of oil palm (Elaeis Guineensis Jacq.) seedling toward the application of organic fertilizer from palm fronds and NPK compound fertilizerThe research was aimed to study the influence between organic fertilizers from palm fronds and NPK compound fertilizer to reduce NPK compound fertilizer in main nursery. The experiment was conducted from January to April 2017 at the Experiment Station Ciparanje, Faculty of Agriculture, Universitas Padjadjaran. The experimental design used was Randomized Block Design that arranged in factorial patterns with two factors and three replications. The fisrt factor was dosage of organic fertilizers from palm fronds consisted of three levels of 0 g/polybag, 800 g/polybag, and 1600 g/polybag and the second factor was dosage of NPK compound fertilizer consisted of four levels of 0 g/polybag, 20 g/polybag, 40 g/polybag, and 60 g/polybag. The result of the experiment showed that there was interaction effect between organic fertilizers from palm fronds and NPK compound fertilizer on height of seedling and dry weight of the shoot. The dosage of 1600 g/polybag organic fertilizers from palm fronds with the dosage of 20 g/polybag NPK compound fertilizer showed the best result in dry weight of the shoot.Keywords: Oil palm seedling, Main nursery, Organic fertilizer, Palm frond, NPK compound fertilizerABSTRAKPenelitian ini bertujuan untuk mengetahui pengaruh interaksi antara pupuk organik asal pelepah kelapa sawit dengan pupuk majemuk NPK yang baik untuk mengurangi penggunaan pupuk majemuk NPK di pembibitan utama kelapa sawit. Percobaan dilaksanakan dari bulan Januari sampai dengan April 2017 di Kebun Percobaan Ciparanje, Fakultas , Universitas Padjadjaran. Rancangan percobaan yang digunakan adalah Rancangan Acak Kelompok dengan pola faktorial yang diulang sebanyak tiga kali. Faktor pertama meliputi dosis pupuk organik asal pelepah kelapa sawit terdiri dari tiga taraf yaitu 0 g/polybag, 800 g/polybag, dan 1600 g/polybag dan faktor kedua dosis pupuk majemuk NPK yang terdiri empat taraf yaitu 0 g/polybag, 20 g/polybag, 40 g/polybag, dan 60 g/polybag. Hasil percobaan menunjukkan bahwa terdapat pengaruh interaksi pupuk organik asal pelepah kelapa sawit dengan pupuk majemuk NPK terhadap tinggi tanaman dan bobot kering tajuk. Perlakuan pupuk organik asal pelepah kelapa sawit 1600 g/bibit dengan pupuk majemuk NPK 20 g/bibit menghasilkan bobot kering tajuk bibit kelapa sawit terbaik.Kata Kunci: Bibit kelapa sawit, Pembibitan utama, Pupuk organik, Pelepah kelapa sawit, NPK

scholarly journals Effect of potassium and zinc on growth, yield and economics of sweet potato (Ipomoea batatas L.) cv. CO-34

2017 ◽  
Vol 9 (1) ◽  
pp. 291-297
Author(s):  
Pravin Singh ◽  
Kavita Aravindakshan ◽  
I. B. Maurya ◽  
Jitendra Singh ◽  
Bhim Singh ◽  
...  
Keyword(s):  
Sweet Potato ◽  
Ipomoea Batatas ◽  
Tuber Yield ◽  
Foliar Application ◽  
Block Design ◽  
Maximum Yield ◽  
Growth Yield ◽  
Cost Ratio ◽  
Average Weight ◽  
Four Levels

A field experiment was conducted to study the effect of different levels of potassium and zinc on growth, yield and economics of sweet potato. The experiment was laid out on clay and loam soil by adopting randomized block design with factorial technique (FRBD). The sixteen treatments consisted of combination of four levels of po-tassium (0, 80, 100 and 120 kg/ha through muriate of potash and four levels of foliar zinc (control i.e. water spray, 10, 20 and 30ppm) through zinc sulphate. The individual application of potassium 120 kg K2O/ha significantly in-creased the number of tubers per plant (4.60), average weight of tuber (275.31 g), length of tuber (16.77 cm), diam-eter of tuber (5.69 cm), tuber yield per plot (9.71 kg), tuber yield per hectare (49.04 t) respectively as compared to control. With the foliar application of zinc (30 ppm) significant increase in number of tubers per plant (4.18), average weight of tuber (234.73 g), length of tuber (18.12 cm), diameter of tuber (5.16 cm), tuber yield per plot (8.33 kg) and tuber yield per hectare (42.05 t) was recordedas compared to control. The treatment combination (120 kg K2O+30ppm Zn) recorded the maximum yield parameters i.e. chlorophyll content (37.00 mg/100 g), average weight of tuber (302.17 g), length of tuber (19.82 cm), diameter of tuber (5.97 cm), maximum tuber yield per plot (11.02 kg), tuber yield per hectare (55.67 t) and benefit-cost ratio (B: C ratio) of 4.22:1.While, the treatment (120 kg K2O+30ppm Zn) had the maximum number of tuber (4.86), minimum number of tuber was recorded in control. From the experi-ment, it appeared that application of potassium and zinc can be used to improve yield and higher net monetary re-turns of sweet potato.

scholarly journals The effect of sorbitol and white sweet potatoes (Ipomea batatas L.) inulin extract application on marshmallow physical, chemical and organoleptic properties

Food Research ◽  
2021 ◽  
Vol 5 (1) ◽  
pp. 298-305
Author(s):  
B. Yudhistira ◽  
A.K. Putri ◽  
S. Prabawa
Keyword(s):  
Sweet Potato ◽  
Design Method ◽  
Sweet Potatoes ◽  
Physical Chemical ◽  
Organoleptic Characteristics ◽  
Randomized Design ◽  
Ipomea Batatas ◽  
The Difference ◽  
The One ◽  
High Calorie

Marshmallow belongs to a high-calorie food that requires a low-calorie substitute for sucrose, one of which is sorbitol. Marshmallow has the potential to become a functional food with the addition of inulin contained within white sweet potatoes. Inulin refers to a type of fructan carbohydrate which contains fiber and has the potential as a prebiotic that is beneficial for the human’s body. This study aims to determine the effect of the addition of white sweet potato (Ipomea batatas L.) inulin extract and sorbitol on the physical, chemical and organoleptic characteristic of marshmallows and to obtain the best marshmallow’s formula through white sweet potato (Ipomea batatas L.) inulin extract and sorbitol addition. The completely randomized design method (CRD) applied in this study consisted of one factor, namely the difference in formulation between the concentration of white sweet potato inulin extract (2% and 3%) and the concentration of sorbitol (25%, 50%, and 75%). The statistical analysis utilized the One Way Analysis of Variance (ANOVA) method using SPSS. The results of this study indicated that the addition of white sweet potato inulin extract and sorbitol had a significant effect on tensile strength, density, moisture content, ash content, total calories, dietary fiber, and organoleptic characteristics of marshmallows. The best formula for marshmallows was formula 4 with the addition of 2% white sweet potato inulin extract and 50% sorbitol.

scholarly journals The influence of addition of various sweet potatoes (Ipomea batatas) extract to total count of cells and antioxidant activity in yogurt

2009 ◽  
Vol 7 (2) ◽  
pp. 68-76
Author(s):  
RETNATI RETNATI ◽  
M.A.M. ANDRIANI ◽  
GUSTI FAUZA
Keyword(s):  
Antioxidant Activity ◽  
Sweet Potato ◽  
Skim Milk ◽  
Total Count ◽  
Sweet Potatoes ◽  
Fresh Milk ◽  
Ipomea Batatas ◽  
Significant Difference ◽  
Potato Extract ◽  
Purple Sweet Potato

Retnati, Andriani MAM, Fauza G. 2009. The influence of addition of various sweet potatoes (Ipomea batatas) extract to total count of cells and antioxidant activity in yogurt. Biofarmasi 7: 68-76. The aim of this research was to determine the influence of addition of various sweet potatoes extract to the total count of cells and the antioxidant activity in yogurt. Yogurt was made from fresh milk, skim milk, white sweet potato, orange sweet potato, purple sweet potato, and pure culture of Streptococcus thermophilus 0040 and Lactobacillus bulgaricus 0041 in straight MRS agar. Fresh milk, skim milk powder (5%, b/v), and sweet potato extract (10%, v/v) was pasteurized at 90oC for 15 minutes, cooled to the temperature between 40-45oC, inoculated with 2.5% S. thermophilus and L. bulgaricus with a proportion of 1.4:1, and then incubated at a temperature of 40oC for 15 hours. Yogurt without an addition of sweet potato extract was used as control. The parameters measured in this experiment were the total count of cells with TPC (Total Plate Count) method and the antioxidant activity with DPPH (2,2- diphenyl-1-picrylhydrazyl) method. Samples were taken at one hour interval to examine the total count of cells, while the antioxidant activity was collected at three hours interval. The result of each analysis was plotted into graphics which describing the relation of total bacteria and antioxidant activity with fermentation time. ANOVA was employed to analyze the data. If there was a significant difference, it should be followed by Duncan Multiple Range Test (DMRT) at a significance level α=0.05. The result of this research showed that the addition of various sweet potatoes extracts increased the total count of cells and the antioxidant activity in yogurt. The total count of cells showed no significant different for each sample, it meant that the different colors in sweet potato did not influence the total count of cells. However, yogurt with orange and purple sweet potato extract addition had a significant difference on the antioxidant activity with control and yogurt with white sweet potato extract. In conclusion, the difference colors in sweet potato influenced in the antioxidant activity in yogurt significantly. Sweet potato is potential for milk substitute in yogurt production due to oligosaccharide content and antioxidant activity.

scholarly journals HAMA PENTING TANAMAN UBI JALAR (Ipomea batatas L.(Lamb)) DI KABUPATEN MINAHASA, MINAHASA UTARA, DAN KOTA TOMOHON

EUGENIA ◽  
2011 ◽  
Vol 17 (2) ◽  
Author(s):  
Odi R. Pinontoan ◽  
Maxi Lengkong ◽  
Henny V.G. Makal
Keyword(s):  
Sweet Potato ◽  
Field Research ◽  
Laboratory Research ◽  
Survey Method ◽  
Pest Species ◽  
Sweet Potatoes ◽  
Potato Plants ◽  
Cylas Formicarius ◽  
Ipomea Batatas ◽  
Important Pest

ABSTRACT The research aimed to identify important pests which attack sweet potato in the field. Field and laboratory research were conducted. The field research was carried out in sweet potato cropping areas in Minahasa Regency, North Minahasa regency and  Tomohon. The laboratory research was conducted in plant pests and disease laboratory, Faculty of Agriculture Sam Ratulangi University Manado to idedntify the important pest species which were found on sweet potato plants. The duration of the study was four months starting from December 2010 until March 2011. Survey method was applied with purposive random sampling.  The research was used 4 period of plant growth namely 1 month, 2 months,3 months, and 4-5 months after planting. The result showed that there were five orders identified, attacking sweet potato since the age of 1-4 months in Minahasa regency, Tomohon and North Minahasa regency. The five orders were Orthoptera, Hemiptera, Homoptera, Lepidoptera, and Coleoptera. The damage on the leaves were caused by pests coreidae, Cicadelidae, Spodoptera sp (Noctuidae), Valanga sp (Acrididae), and Oxya sp. (Acrididae), whereas on the stem was Omphisa sp (Pyralidae). Damage on the tuber was caused by Gryllotalpa sp (Gryllotalpidae), Cylas formicarius (Curculionidae) and Oryctes sp (Dynastidae). Key words : Important Pest Plant Sweet Potatoes, Ipomea batatas L.

scholarly journals The Effect of leaves Feeding with Heomic Acid in Some Growth and Producing Properties of Sun Flower Plant. Helianthus annuus L: تأثير التغذية الورقية بحامض الهيوميك في بعض صفات النمو والحاصل لنبات زهرة الشمس .Helianthus annuus L

2017 ◽  
Vol 1 (4) ◽  
Author(s):  
Ali Moutcher Murzah Al-Shamri - Najm Abdullah Juma Al - Zuba
Keyword(s):  
Humic Acid ◽  
Helianthus Annuus ◽  
Block Design ◽  
Total Yield ◽  
Dry Weight ◽  
Growth And Yield ◽  
Helianthus Annuus L ◽  
Flower Plant ◽  
Loam Soil ◽  
Four Levels

A factorial experiment was applied according to Randomized Complete Block Design (R.C.B.D) with three replications, during the spring season 2017 in Diyala / Baquba / Buhriz city, using silt loam soil to study the effect of four levels of foliar fertilization with humic acid 0, 2, 4, 6 ml.L-1 in the growth and yield of sunflower, Helianthus annuus  L. (LuLeo). The results showed significant differences for level of humic acid 6 ml.L-1 in plant height which gave an average 213.73 cm, leaf area of the plant 5597.32 cm2, chlorophyll index 48.64 SPAD, dry weight of the plant 215.0 g, number of seeds in the flowery disc 1494 seed.disc-1, 1000 seeds weight 88.3 g, plant yield 127.91 g.plant-1, total yield 6.81 ton.h-1 and oil percentage in the seeds 43.184%, while the level 4 ml.L-1 humic acid gave the highest average for the protein percentage in the seeds 18.34%.

scholarly journals Kajian Pemberian Pupuk Kandang Ayam Pedaging dan Pupuk Hayati terhadap Pertumbuhan dan Hasil Petsai (Brassica chinensis L.)

2020 ◽  
Vol 2 (2) ◽  
pp. 77-88
Author(s):  
Jhon Hardy Purba ◽  
Putu Sri Wahyuni ◽  
Irwan Febryan
Keyword(s):  
Linear Relationship ◽  
Broiler Chicken ◽  
Block Design ◽  
Dry Weight ◽  
Chicken Manure ◽  
Growth And Yield ◽  
Randomized Block Design ◽  
Economic Weight ◽  
Four Levels ◽  
The Relationship

Abstract. This research aims to determine the effect of broiler manure doses and BiotamaxTM biofertilizers on growth and yield of Chinese cabbage in the Selat Village, Buleleng Regency, Bali from November - December 2018. The randomized block design (RBD) factorial, consisting of two factors was the experimental design used in this research. The first factor is the dose of broiler manure (A), composed of 3 levels, namely control (A0), a dose of 15 tons.ha-1 (A1), and 30 tons.ha-1 (A2). The second factor is the application frequency of biological fertilizers with four levels, namely control (B0) which was administered concurrently for seven days before planting at a dose of 0.09 g.plots-1. B1 with an administrative frequency of 7 and 14 days before and after planting (HST), respectively, with a dose of 0.045 g.plots-1. (B2) with a 3times administrative frequency of 7, 14, and 28 days before, after birth and after each dose of 0.03 g.plots-1 (B3). The results of the study, the frequency of giving BiotaMaxTM biological fertilizer at the same time, provided the heaviest oven-dry weight per crop, which was 9.39 g. The treatment of broiler chicken manure dose of 30 tons.ha-1 (A2), resulted in the best oven-dry weight canopy per plant at 9.26 g. The relationship between the dose of broiler chicken manure with canopy oven-dry weight per plant showed a linear relationship, namely y = 0.0608x + 7.2483 (R2 = 32.53). The best economic weight per hectare is obtained in the provision of 30 tons.ha-1 (A2) broiler manure, weighing 30.10 tons.ha-1. The relationship between the dose of broiler manure and economic weight per hectare shows a linear relationship, y = 0.3247x + 21.699 R² = 59.88%. The frequency of giving BiotaMaxTM biofertilizers at the same time is 7 days before planting at a dose of 0.09 g.plots-1 (B1) gave the heaviest economic weight per hectare, at 28.21 tons.ha-1. The combination of broiler chicken manure dose and the frequency of BiotaMaxTM biofertilizer gave no significant effect (p≥0.05) on the growth and yield of Chinese cabbage.Keywords: broiler manure, biofertilizer frequency, petsaiAbstrak. Penelitian yang bertujuan mengetahui pengaruh dosis pupuk kandang ayam pedaging dan pupuk hayati BiotamaxTM serta interaksinya terhadap pertumbuhan dan hasil petsai dilaksanakan di Desa Selat, Kabupaten Buleleng, Bali pada bulan November - Desember 2018. Rancangan percobaan yang digunakan adalah rancangan acak kelompok (RAK) faktorial, terdiri atas dua faktor. Faktor pertama adalah dosis pupuk kandang ayam pedaging (A), terdiri atas 3 tingkat, yaitu kontrol (A0), dosis 15 ton.ha-1 (A1), dan 30 ton.ha-1 (A2). Faktor ke dua adalah frekuensi pemberian pupuk hayati dengan empat tingkat, yaitu kontrol (B0), pemberian sekaligus yaitu 7 hari sebelum tanam dengan dosis 0,09 g.petak-1 (B1); frekuensi pemberian 2 kali yaitu 7 hari sebelum tanam dan 14 hari sesudah tanam (hst) dengan dosis setiap pemberian 0,045 g.petak-1 (B2); frekuensi pemberian 3 kali yaitu 7 hari sebelum tanam, 14 hst dan 28 hst dengan dosis setiap pemberian 0,03 g.petak-1(B3). Hasil penelitian, frekuensi pemberian pupuk hayati BiotaMaxTM sekaligus, memberikan berat kering oven tajuk per tanaman terberat, yaitu 9,39 g. Perlakuan dosis pupuk kandang ayam pedaging dosis 30 ton.ha-1 (A2), menghasilkan berat kering oven tajuk per tanaman terbaik yaitu 9,26 g. Hubungan antara dosis pupuk kandang ayam pedaging dengan berat kering oven tajuk per tanaman menunjukan hubungan linier, yaitu y = 0,0608x + 7,2483 (R2=32,53). Berat ekonomis per hektar terbaik didapatkan pada pemberian dosis pupuk kandang ayam pedaging 30 ton.ha-1 (A2), yaitu seberat 30,10 ton.ha-1. Hubungan antara dosis pupuk kandang ayam pedaging dan berat ekonomis per hektar menunjukan hubungan linier, yaitu y = 0,3247x + 21,699 R²=59,88%. Frekuensi pemberian pupuk hayati BiotaMaxTM sekaligus yaitu 7 hari sebelum tanam dengan dosis 0,09 g.petak-1 (B1) memberikan berat ekonomis per hektar terberat, yaitu 28,21 ton.ha-1. Kombinasi dosis pupuk kandang ayam pedaging dan frekuensi pemberian pupuk hayati BiotaMaxTM berpengaruh tidak nyata (p≥0,05) terhadap pertumbuhan dan hasil petsai.    Kata kunci: Pupuk Kandang Ayam Pedaging, Frekuensi Pupuk hayati, Petsai.

scholarly journals REDUCING CHEMICAL FERTILIZER IN SWEET POTATO CULTIVATION BY USING MIXED BIOFERTILIZER

2021 ◽  
Vol 52 (4) ◽  
pp. 1031-1038
Author(s):  
Hindersah & et al.
Keyword(s):  
Sweet Potato ◽  
Block Design ◽  
Chemical Fertilizer ◽  
Nutrient Cycle ◽  
Sweet Potatoes ◽  
Available Nitrogen ◽  
Potato Varieties ◽  
Combined Application ◽  
Randomized Block Design ◽  
Phosphate Solubilizing

Biofertilizer enable to improve nutrient cycle in soil and induce plant growth and production, but sweet potatoes farmers in Indonesia are still use only chemical fertilizer as a source of plant nutrient. The objectives of this experiment were to evaluate the effect of different doses of consortium biofertilizer to reduce chemical fertilizer dose; and maintain yield and sweetness of two sweet potato varieties. The experimental design was completely randomized block design which tested six combinations of different chemical fertilizer and biofertilizer doses. Analysis of variance was performed to determine any significant differences between the means of treatments. The results showed that the response of both sweet potatoes varieties on combined application of chemical and bio fertilizer was differ. All treatments did not change tuber number and weight of sweet potato var. Awachy-1 but increased those of var. Rancing. Application of diazotrophic bacteria (Azotobacter, Azospirillum and Acinetobacter) mixed with phosphate solubilizing microbes (Pseudomonas and Penicillium) with reduced fertilizer doses up to 75% did not alter soil available nitrogen and phosphorous. Despite different fertilizer rates, tubers number of both sweet potato varieties in individual plot was similar. Yield did not change due to reduction of fertilizer dose up to 75% when biofertilizer was applied. However, yield was potentially decreased when chemical fertilizer was only 50%. All fertilizer treatments did not change the sweetness of tuber which indicated by constant brix. Research suggested that biofertilizer might substitute 25% of chemical fertilizer to obtain the same yield and quality of tuber, and maintain the availability soil nitrogen and phosphorous. 

scholarly journals EFFECTIVENESS OF SOME NITROGEN DOSE AND CELLULOLYTIC MICROORGANISM (MOS) TOWARD DECOMPOSITION RATE OF TAN AND EMPTY AEROBIC PALM

2016 ◽  
Vol 1 (1) ◽  
pp. 33-36
Author(s):  
Sakiah Sakiah ◽  
Mariani Sembiring
Keyword(s):  
Oil Palm ◽  
Decomposition Rate ◽  
Block Design ◽  
Dry Weight ◽  
Nitrogen Levels ◽  
Empty Fruit Bunches ◽  
Cellulolytic Microorganisms ◽  
Randomized Block Design ◽  
Two Factors ◽  
Four Levels

This study aims to determine the effect of nitrogen levels, cellulolytic microorganisms and the interaction of both the aerobic decomposition rate of oil palm empty fruit bunches. The research was conducted at Home Compost STIP-AP Medan in April until July 2016. Research used a factorial randomized block design consisting of two factors and three replications. The first factor is the dose of nitrogen consisting of four levels i.e. N0 = without urea, N1 = dose of Nitrogen 2% of the dry weight of TKS which is 40% as much as 48 grams, N2 = dose of Nitrogen 4% of the dry weight of TKS which is 40% as much as 96 grams, N3 = Nitrogen dose of 6% of the dry weight of TKS which is 40% as much as 144 grams. The second factor is the cellulolytic microorganism isolates comprising four levels i.e. M0 = without cellulolytic microorganisms isolates, with isolates MOS M1 = 10 ml, M2 = isolate MOS 20 ml, isolate MOS M3 = 30 ml. From the research the effectiveness of multiple doses of nitrogen and cellulolytic microorganisms (MOS) on the rate of decomposition of oil palm empty fruit bunches can be deduced as follows, namely addition of nitrogen dose was able to reduce levels of C/N was 76.4% of the levels of C/N beginning. The best treatment is contained in N3 treatment. Addition of Microorganisms treatment cellulolytic (MOS) is able to reduce levels of C/N as much as 74.6% of the levels of C/N beginning. The best treatment is contained in M3 treatment. Interaction between giving treatment cellulolytic microorganisms Nitrogen and reducing levels of C/N as much as 79.4%. Interaction best treatment there in treatment N3M3.

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