Effect of weather parameters on the population dynamics of White backed planthopper, Sogatella furcifera (Horvath) in rice

2021 ◽  
Vol 58 (1) ◽  
pp. 15-20
Author(s):  
ADVSLP Anand Kumar ◽  
N Mallikharjuna Rao ◽  
CV Rama Rao ◽  
S Krishnam Raju
Keyword(s):  
Population Dynamics ◽  
Andhra Pradesh ◽  
Agricultural Research ◽  
Abiotic Factors ◽  
Research Station ◽  
Sogatella Furcifera ◽  
Correlation Studies ◽  
Weather Parameters ◽  
Two Peaks ◽  
Second Peak

A field experiment on the population dynamics of White backed planthopper (WBPH), Sogatella furcifera (Horvath) carried out during kharif and rabi 2016-17 at Regional Agricultural Research Station, Maruteru, West Godavari District of Andhra Pradesh, India revealed that the incidence of WBPH was observed during 36th SMW (September 3-9). Its activity increased during successive weeks up to 44th SMW with two peaks, first peak at 38th SMW (September 17-23) with population of 46/10 hills and second peak at 42nd SMW (October 15-21) with population of 170/ 10 hills during kharif 2016, while WBPH was first noticed during 7th SMW (February 12-18) and population increased gradually during successive weeks and attained peak number during 13th SMW (March 26-April 1) in rabi 2016-17. Correlation studies revealed that WBPH had significant negative relation with morning relative humidity of current week during kharif 2016. None of the abiotic factors has showed significant relationship with the population of WBPH during rabi 2016-17.

scholarly journals Evaluation of Chickpea (Cicer arietinum L.) Genotypes for Yield and Drought Tolerance under Rain Fed and Irrigated Conditions

2020 ◽  
pp. 33-42
Author(s):  
R. Divya Madhuri ◽  
V. Jayalakshmi ◽  
M. Shanthi Priya
Keyword(s):  
Andhra Pradesh ◽  
Yield Loss ◽  
Agricultural Research ◽  
Block Design ◽  
High Yield ◽  
Research Station ◽  
Drought Tolerant ◽  
Major Constraint ◽  
Randomized Complete Block Design ◽  
The Mean

In Southern India, drought stress is a major constraint to chickpea production and yield stability. Drought tolerant index (DTI) that provides a measure of drought based on yield loss under drought condition in comparison to normal condition was used for screening drought-tolerant genotypes. This study was conducted to determine drought tolerant genotypes with high yield in stress and non-stress conditions utilising physiological traits. Thirty chickpea genotypes were tested in a randomized complete block design with three replications under rain fed and irrigated conditions at Regional Agricultural Research Station, Nandyal, Andhra Pradesh, India during rabi, 2018-2019. The analysis of variance carried out for yield and drought tolerant traits revealed highly significant differences among the genotypes for all characters under rain fed as well as irrigated conditions. NBeG 776, NBeG 779, NBeG 868, ICCV 181606, MH 13 and MH 14 are drought tolerant. NBeG 776, NBeG 779 and NBeG 868 are suitable under both rain fed and irrigated conditions with significantly higher yields over their respective means. ICCV 181606, MH 13 and MH 14 are suitable exclusively for rain fed condition with significantly superior yields over the mean.

scholarly journals Population dynamics of stem fly and defoliator pests of soybean and their natural enemies in relation to weather parameters

2021 ◽  
Vol 17 (AAEBSSD) ◽  
pp. 17-26
Author(s):  
R. Bala Muralidhar Naik ◽  
K. Vijaya Lakshmi ◽  
M. Venkataiah ◽  
C. Srinivas ◽  
G. Uma Devi ◽  
...  
Keyword(s):  
Natural Enemies ◽  
Insect Pests ◽  
Agricultural Research ◽  
Growth Stages ◽  
Research Station ◽  
Peak Activity ◽  
Lepidopteran Insect ◽  
Weather Parameters ◽  
Lepidopteran Pest ◽  
Tobacco Caterpillar

The field experiment was carried out at Polasa Farm, Regional agricultural research station Jagtial during the Kharif, 2014-15 and 2015-16. Study about pre dominant lepidopteran insect –pests in soybean crop noticed that the tobacco cut worm, (Spodptera exigua Hubner), green semi looper(Crysodexis acuta Walker), and tobacco caterpillar (Spodoptera litura Fab) along with stemfly, (Melanagromyza obtusa Zehnter) as non lepidopteran pest were noticed at various growth stages of cropgrowth. The peak activity of stem fly (37.84%) was observed during 37th standard week per meter row) for the year 2014 and for the year 2015 to a maximum infestation of 35.70 per cent during 30th std.week. The peak activity of caterpillar pests i.e., S. litura (7.6 larvae per meter row) for the year 2014 was observed during 34th std.week and for the year 2015 (12.4 per meter row during 36th std.week and C. acuta (0.7 larvae per meter row) during 36th std. week for the year 2014 and for the year 2015 (2.20 larvae/mrl on 37th std week. S. exigua (1.6 larvae per meter row) for both the years 2014 and 2015 was observed during 32th std.week Among the natural enemies, one predators namely, spiders (Oxyopes sp. was observed to prey on the insect pests.The biocontrol agent’s one species, lynx spider, Oxyopes sp. population recorded on the crop during Kharif , 2014 ranged from 0.15 to 0.40 /mrl and 0.15 to 0.60/ mrl during Kharif, 2015.

scholarly journals Varietal performance of rice under different source of nutrition in high altitude and tribal areas of Andhra Pradesh

2021 ◽  
Vol 16 (1) ◽  
pp. 46-51
Author(s):  
A. Upendra Rao ◽  
K. Tejeswara Rao ◽  
D. Sekhar ◽  
V. Visa Lakshmi ◽  
N. Hari Satyanarayana
Keyword(s):  
Grain Yield ◽  
High Altitude ◽  
Organic Farming ◽  
Andhra Pradesh ◽  
Agricultural Research ◽  
Growth Yield ◽  
Scientific Data ◽  
Research Station ◽  
Yield Attributes ◽  
Tribal Areas

A field experiment was conducted for two consecutive Kharif seasons of 2012-13 and 2013-14 in a Split Plot Design with three replications, at Agricultural Research Station, Seethampeta, Andhra Prtadesh, India to generate scientific data on organic farming, integrated nutrient and pest management practices, chemical farming with four prominent varieties of rice viz., MTU 1001, RGL 2538, BPT 5204 and MTU 7029 in high altitude and tribal areas of Andhra Pradesh. Results showed that, grain yield of rice was reduced in organic farming by 37 per cent and 30.23 per cent compared to chemical farming and INM practices. Growth, yield attributes of rice also reduced noticeably in organic farming. Whereas, organic farming recorded higher root biomass per hill at flowering, higher post nutrient status of available nitrogen, phosphorus and potassium and lesser incidence of diseases and pests over INM and chemical farming. Chemical farming recorded higher growth, yield attributes, yield and returns. Among the cultivars, MTU 1001 showed better performance and recorded the higher grain yield and straw yields and least affected by diseases and pests compared to other varieties.

Population dynamics of aphid, Myzus persicae (Sulzer)(Hemiptera: Aphididae) on different Brassica species

2017 ◽  
Author(s):  
Joni Kumar ◽  
Bishwajeet Paul
Keyword(s):  
Population Dynamics ◽  
Abiotic Factors ◽  
Correlation Coefficients ◽  
Brassica Species ◽  
Significant Negative Correlation ◽  
Aphid Population ◽  
Maximum Temperature ◽  
Rabi Season ◽  
Rapid Multiplication ◽  
Weather Parameters

Present studies deal with continuous observation of aphid population on different brassica species at every fourteen days interval. Five plants were selected randomly from each plot. The top 10cm terminal portion was used for counting of aphid population. The first appearance of aphid population was found at end of December in Brassica rapa var toria, B. rapa var yellow sarson and Brassica juncea. The correlation coefficients between aphid population and abiotic factors revealed contradictory results. Except for a few instances the abiotic parameters show a low order of association with aphid population. A significant negative correlation of aphid population was found with maximum temperature in B. rapa var toria (r= -0.963**), B. rapa var yellow sarson (r= -0.877*) and B. juncea (r= -0.913*). The population dynamics study of coccinellid beetles revealed that its population increased gradually with the increase of aphid population and vice-versa. In our experiment none of the weather parameters alone was responsible for the multiplication and growth of the aphid but it is assumed that during major part of rabi season, the meteorological parameters remained conducive for the rapid multiplication of aphid.

Evaluation of groundnut genotypes for phosphorus efficiency through leaf acid phosphatase activity

2018 ◽  
Author(s):  
K.V. Naga Madhuri ◽  
P. Latha ◽  
R. P. Vasanthi ◽  
K. John ◽  
P.V.R.M. Reddy ◽  
...  
Keyword(s):  
Acid Phosphatase ◽  
Phosphatase Activity ◽  
Acid Phosphatase Activity ◽  
Andhra Pradesh ◽  
Agricultural Research ◽  
Phosphorus Efficiency ◽  
Research Station ◽  
Soil P ◽  
P Content ◽  
Leaf P

Phosphorus (P) sources are limited around the globe making it unsustainable with present farming practices. This necessitates the development of more phosphorus efficient crops while monitoring P status. Groundnut (Arachis hypogaea L.) is a major crop in Southern Andhra Pradesh, India where soils are light textured and less fertile. Twenty groundnut genotypes were evaluated under a pot culture experiment conducted at Regional Agricultural Research Station, Tirupati, Andhra Pradesh, India during kharif, 2016 grown using standard crop recommended practices in P-sufficient (control) and in P-deficient conditions. Leaf Acid phosphatase activity and leaf P content were monitored after 60 days of sowing while kernel P and pod yields were recorded at harvest and estimated using standard protocols. Results showed that under P deficient conditions, genotypes TCGS 1616, TCGS 1622, TCGS 1624, TCGS 1517 and Greeshma had higher leaf P accumulation (between 0.20 % to 0.24 %) in comparison to others. Genotypes TCGS 1616, TCGS 1624, and TCGS 1517 reported high kernel P when compared to others under P starved conditions. Likewise under deficient soil P conditions, TCGS 1528, TCGS 1624, TCGS 1517 and Greeshma (range 2.71-4.45 µmoles hr-1g-1) demonstrated having lower leaf acid phosphatase content in leaves when compared to other genotypes. Only TCGS 1624, TCGS 1616 and Greeshma had lower leaf acid phosphatase while at the same time having higher accumulation of leaf P and highest pod yield followed by TCGS 1517 suggesting that P starvation was better coped by these genotypes and hence can be recommended in soils deficient in P. Leaf acid phosphatase activity correlated negatively with P content in leaves (r = -0.73) similar to those reported for soybean cultivars in Brazil. There is potential for breeders in accelerating identification of markers to specific traits that would be suitable for monitoring P status and manage nutrient application.

scholarly journals Temporal Variation of Ambient PM10 Concentration within an Urban-Industrial Environment

2018 ◽  
Vol 34 ◽  
pp. 02002
Author(s):  
Yoon-Keaw Wong ◽  
Norazian Mohamed Noor ◽  
Nur Izzah Mohamad Hashim
Keyword(s):  
Carbon Monoxide ◽  
Forest Fires ◽  
Urban Areas ◽  
Ambient Air ◽  
Pm10 Concentration ◽  
Strongly Correlated ◽  
Time Series Plot ◽  
Weather Parameters ◽  
Two Peaks ◽  
Second Peak

PM10 concentration in the ambient air has been reported to be the main pollutant affecting human health, particularly in the urban areas. This research is conducted to study the variation of PM10 concentration at the three urban-industrial areas in Malaysia, namely Shah Alam, Kuala Terengganu and Melaka. In addition, the association and correlation between PM10 concentration and other air pollutants will be distinguished. Five years interval dataset (2008-2012) consisting of PM10, SOX, NOX and O3 concentrations and other weather parameters such as wind speed, humidity and temperature were obtained from Department of Environment, Malaysia. Shah Alam shows the highest average of PM10 concentration with the value of 62.76 μg/m3 in June, whereas for Kuala Terengganu was 59.29 μg/m3 in February and 46.61 μg/m3 in August for Melaka. Two peaks were observed from the time series plot using the averaged monthly PM10 concentration. First peak occurs when PM10 concentration rises from January to February and the second peak is reached in June and remain high for the next two consecutive months for Shah Alam and Kuala Terengganu. Meanwhile the second peak for Melaka is only achieved in August as a result of the transboundary of smoke from forest fires in the Sumatra region during dry season from May to September. Both of the pollutants can be sourced from rapid industrial activities at Shah Alam. PM10 concentration is strongly correlated with carbon monoxide concentration in Kuala Terengganu and Melaka with value of r2 = 0.1725 and 0.2744 respectively. High carbon monoxide and PM10 concentration are associated with burning of fossil fuel from increased number of vehicles at these areas.

scholarly journals Population dynamics of natural enemies on bt / non bt cotton and their correlation with weather parameters

2017 ◽  
Vol 9 (4) ◽  
pp. 2360-2365 ◽  
Author(s):  
Roomi Rawal ◽  
K. K. Dahiya ◽  
Roshan Lal ◽  
Adesh Kumar
Keyword(s):  
Population Dynamics ◽  
Natural Enemies ◽  
Maximum Temperature ◽  
Adult Plant ◽  
Bt Cotton ◽  
Crop Season ◽  
Cotton Genotypes ◽  
Weather Parameters ◽  
Two Peaks ◽  
Cotton Cultivar

The field study was carried out at Research Farm of cotton section, Department of Genetics and Plant Breeding, CCS Haryana Agricultural University, Hisar, India to determine the effect of environmental factors and seven cotton genotypes (Bt and non Bt) on three natural enemies namely chrysoperla, coccinellids beetle and spi-ders. Natural enemies remained active throughout the crop season (with two peaks) with little differences among them. Chrysoperla and coccinellids both were remained active from 25th to 40th SMW (June to October, 2014) while spiders were active from 25th to 41st. It was observed that highest population of Chrysoperla (1.17 eggs/plant) and spiders (1.59 adult/plant) was observed on Bt cotton cultivar namely RCH-134 and JK-1947 respectively. However, coccinellids preferred non Bt genotype (HHH-223) for their population build-up. Chrysoperla and coccinellids popula-tion was significantly negatively correlated with maximum temperature (r = -0.527 at 5% and r = -0.626 at 1% re-spectively); positively correlated with RHm, RHe; negatively correlated with minimum temperature and wind speed without significance. While, spiders population showed negative correlation with all weather parameters except sun-shine hours. It was observed that population of the natural enemies fluctuated under different environmental conditions during cotton season.

scholarly journals On Farm Testing of Rice Variety NDLR-7 as an Alternative to Traditionally Grown BPT-5204 in Kurnool District of Andhra Pradesh

2020 ◽  
Author(s):  
M. Jayalakshmi ◽  
G. Prasad Babu ◽  
B. H. Chaithanya
Keyword(s):  
Andhra Pradesh ◽  
Agricultural Research ◽  
Oryza Sativa L ◽  
Gall Midge ◽  
Rice Variety ◽  
Sheath Blight ◽  
Research Station ◽  
Rural And Urban ◽  
Back Ground ◽  
On Farm

Back Ground: Rice (Oryza Sativa L.) is major crop in Andhra Pradesh being cultivated in 22.11 lakh ha average productivity of 3350Kg/ha Local BPT-5204 (samba mashuri) is high susceptibility to blast, sheath blight and gall midge. Since this is consumers’ preference both in the rural and urban markets, farmers are cultivating BPT-5204 though this variety is susceptibility to blast and BPH leads to high cost of cultivation .As an alternative to this NDLR-7 variety developed by Regional Agricultural Research Station (RARS), Nandyal, ANGRAU NDLR-7 was tolerant to blast, BPH, sheath blight, leaf folders and gall midge. Methods: NDLR-7 was introduced by KVK, Banavasi through on farm trail during 2016-17 and this trial was continued for three years as an alternative to traditionally grown BPT-5204. Result: The data from the three years of on farm trail reveals that the cost of cultivation has drastically reduced from Rs. 66050/ha to 50,538/ha due to reduced use of pesticides. The yield in demonstration plot (NDLR-7) was 7437.5 Kg/ha compared to control (5812 Kg/ha).

Seed yield and quality of soybean [Glycine Max (L.) Merill] as influenced by cultivar and sowing date in vertisols of Andhra Pradesh during kharif season

2017 ◽  
Author(s):  
K. Prabhakar ◽  
Y. Padmalatha ◽  
K. Venkataramanamma ◽  
P. Muniratnam ◽  
V. Radhakrishnamurthy
Keyword(s):  
Seed Yield ◽  
Andhra Pradesh ◽  
Agricultural Research ◽  
Sowing Date ◽  
Germination Percentage ◽  
Research Station ◽  
Yield And Quality ◽  
Sowing Dates ◽  
Glycine Max L

In order to study the effect of planting date and cultivar on seed yield and germinating ability of soybean, an experiment was conducted for two seasons (2014 – 15 and 2015 – 16 ) at Regional Agricultural Research Station, Nandyal, Andhra Pradesh. Two popular varieties, viz., JS-335 and JS-93-05 were sown on four sowing dates i.e. July 2nd fortnight (FN), August 1st FN, August 2nd FN and September 1st FN during the two consecutive kharif crop seasons in FRBD design, replicated thrice. The variety JS-335 recorded significantly higher yield (1296 kg ha-1) than JS-93-05 (690 kg ha-1) . Early sowings during July 2nd FN and August Ist FN recorded significantly at par yields (1087 kg ha-1, 1101 kg ha-1 respectively) with good initial and aging germination percentage (81%, 58.8% respectively). Though September 1st FN sown crop recorded significantly lowest seed yield (860 kg ha-1), the initial and aging germination percentage were highest (88.6%, 66.0%).

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