R. Mahender Kumar

Sam Higginbottom Institute of Agriculture

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A Suryakala

Office of the Chief Scientist

Shantappa Duttarganvi

University of Agricultural Sciences Raichur

M. K. Naik

Acharya N. G. Ranga Agricultural University

K. Yella Reddy

Acharya N. G. Ranga Agricultural University

G. Pratibha

Central Research Institute for Dryland Agriculture

M. R. Umesh

University of Agricultural Sciences Raichur

B. Ramana Murthy

Acharya N. G. Ranga Agricultural University

B. K. Desai

University of Agricultural Sciences Raichur

B. T. Pujari

GVK (India)

B. G. Koppalkar

University of Agricultural Sciences Raichur

Cooperative Institutions

Acharya N. G. Ranga Agricultural University

Professor Jayashankar Telangana State Agricultural University

Indian Institute of Rice Research

Central Research Institute for Dryland Agriculture

Indian Council of Agricultural Research

Sri Venkateswara Veterinary University

University of Agricultural Sciences Raichur

Research Applications (United States)

Institute of Crop Science

Tamil Nadu Agricultural University

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Yield attributes and yield of rice (Oryza sativa) hybrids as influenced by nitrogen sources and its splits application

Indian Journal of Agronomy (2001)

K. SLIREKHA M. NARAYANA REDDY R. Mahender Kumar

In a field experiment conducted during the wet season of 1994 and 1995 on a deep black soil (Vertisol), the differential response of recently released rice (Oryza sativa L.) hybrids in terms of their yield components and yield to NH,-N and NH, + NO3-N sources [through urea and calcium ammonium nitrat, (CAN) respectively] and split application of N (as 3 and 4 equal splits) was studied. Four rice hyrbids, 2 of early (MGR 1 and KRH 1) and and the other 2 of mid-duration (APRH 1 and APRH 2) were tested using 2 checks (Rasi and Jaya). More stable and easily available NH,-N was found to be superior to unstable and leachable NO3-N fraction from CAN which resulted in higher number of tillers and panicles and was mainly responsible for higher grain yields (6.40 and 5.44 tonneslha with NH,-N and 5.73 and 4.59 tonneslha with NH, + NO,-N in1994 and 1995 respectively). Application of N in 4 splits, coinciding the last with flowering, improved filled grain percentage, 1,000- grain weight and finally resulted in higher grain yields owing to increased photosyn- thetic rate and delayed leaf senescence. Among the hybrids. MGR 1 in the short- duration group emerged as the most promising by outyielding the check Rasi to the extent of 18-20% more. Grain yield showed significant correlatidn during 2 years with tiller number (r = 0.48* and 0.68*), panicle number (r = 0.47* and 0.66**), filled grain percentage (r = 0.36 and 0.53**) and 1,000-grain weight (r = 0.48* and 0.39). The multiple linear regression analysis revealed significant contribution of 67% by tillers, panicles, spikelets, filled grain percentage and 1,000-grain weight towards grain yield.

Panicle

Tiller (botany)

Vertisol

10.59797/ija.v44i1.3469

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Citations (1)

Grain Yield, Yield Components, Soil Fertility, and Biological Activity under Organic and Conventional Rice Production Systems

Communications in Soil Science and Plant Analysis (2010)

K. Surekha P. C. Latha K. V. Rao R. Mahender Kumar

A field experiment was conducted for 2 years on a clayey Vertisol to compare the organic and conventional methods of rice farming. Two main plot treatments were with and without plant protection and four subplot treatments were (1) control (CON); (2) inorganic fertilizers (CF); (3) organics (OF), and (4) inorganics + organics (integrated nutrient management, INM). The organics were green manure, paddy straw, and poultry manure. After 2 years, the main plot effects were not significant in terms of crop productivity though there was a reduction in soil biological parameters. Increase in grain yield was larger with inorganics and INM as compared to the organics because of the higher panicle number. However, organics increased the microbial populations, biomass carbon, nitrogen, enzyme activities, and soil fertility as compared to inorganics. Thus, organics improved the nutrient availability by influencing the soil biological activity although it did not reflect in greater yields.

Vertisol

Soil carbon

10.1080/00103624.2010.507834

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Citations (15)

Productivity and economics of rice (Oryza sativa)–maize (Zea mays) as influenced by methods of crop establishment, Zn and S application in rice

Indian Journal of Agronomy (2010)

A. G. Chandrapala M. Yakadri R. Mahender Kumar G. Bhupal Raj

A field experiment was conducted during 2007–08 and 2008–09 at Hyderabad, to study the effect of three rice (Oryza sativa L.) establishment methods [sowing of sprouted rice under puddle condition (DS) at 25 cm x 25 cm, system of rice intensification (SRI) seedlings transplanted at 25 cm x 25 cm and conventional transplanting (CT) at 20 cm x 15 cm] as main plots and five nutrient combinations (NPK, NPK + Zn, NPK + S, NPK + Zn + S and NPK + FYM) in sub - plots on rice-maize (Zea mays L.) sequence in a spilt plot design with treatments replicated thrice. On an average rice under SRI recorded the higher drymatter accumulation/hill, yield attributes and yield. On an average SRI rice – maize sequence recorded the highest rice equivalent yield (11.37 t/ha on mean basis), net returns (58,346 Rs/ha) and benefit: cost ratio (BCR). Application of S, Zn and FYM improved significantly the productivity of rice and succeeding maize crop. Among nutrient management practices, NPK + Zn + S recorded higher grain yield (5.27 t/ha) and yield attributes during both years of rice cultivation, except that it was on par with NPK + FYM in 2008–09. Similar trend was also observed in uptake of nutrients. Based on the systems productivity (11.72 t/ha), net returns (58,983 Rs/ha), and BCR, NPK + Zn + S treatment excelled all other nutrient combinations. SRI method used 23 and 25% less water compared to CT and DS. NPK + FYM application to rice crop recorded significantly highest quantity of available soil N, P and K content after crop harvest. While, highest available soil S and Zn content was recorded by the treatments where in respective nutrients were applied in the previous season to rice. Thus it is concluded that SRI rice – maize is more productive, beneficial and efficient water user. Both Zn and S be applied to rice to raise the productivity of subsequent maize too.

Transplanting

Nutrient Management

Non-invasive ventilation

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Citations (24)

Effect of nutrient management interventions on system productivity of rice-ragi sequence in Coastal Andhra Pradesh

ORYZA- An International Journal on Rice (2020)

Sanjay Kumar Ch. Pulla Rao V.R.K. Murthy Yashoda Rani P. R. K. Prasad

A field experiment was conducted during kharif season of 2017 & 2018 and rabi season of 2017-18 and 2018-19 on sandy loam soil of the Agricultural College Farm, Bapatla to evaluate the system productivity of rice- no till ragi cropping system with seven treatments in kharif and in rabi season each kharif treatment divided into four sub treatments. The experiment consisted of seven treatments viz., T1 : 100% RDF (100-60-40 N-P-K kg ha-1) ; T2: 100% RDF + soil application of ZnSO4 @ 50 kg ha-1 ; T3: 125% RDF + soil application of ZnSO4 @ 50 kg ha-1; T4: 75% RDF + poultry manure @ 0.82 t ha-1 + soil application of ZnSO4 @ 50 kg ha-1; T5: 75% RDF + FYM @ 5.0 t ha-1 + soil application of ZnSO4 @ 50 kg ha-1; T6: 50% RDF + poultry manure @1.6 t ha-1 + soil application of ZnSO4 @ 50kg ha-1 and T7: 50% RDF + FYM @ 10 t ha-1 + soil application of ZnSO4 @ 50 kg ha-1. The experiment was laid out in Randomized Block Design and replicated thrice during kharif rice and in rabi four sub treatments i.e, S1:No fertilizer, S2:100% RDF (30-30-20 N-P-K kg ha-1), S3:75% RDF (22.5-22.5-15 N-P-K kg ha-1) and S4:50% RDF (15-15-10 N-P-K kg ha-1) and hence, split plot design was adopted. Maximum rice equivalent yield of ragi (8108, 8570 and 8339 kg ha-1 in both the years and in pooled data respectively) as well as system productivity of rice-ragi (13452, 14036 and 13744 kg ha-1 in both the years and in pooled data respectively) sequence was observed with 50% RDF + FYM @ 10 t ha-1 + ZnSO4 @ 50 kg ha-1 as residual effect, among the fertilizer levels, S2 level i.e., 100 % RDF (30-30-20 kg N-P-K ha-1) on succeeding ragi crop (7413, 8003,7708 and 11893,12641, 12267 kg ha-1 rice equivalent yield and system productivity respectively in both the years and in pooled data).

Kharif crop

Nutrient Management

Cropping system

10.35709/ory.2020.57.3.6

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Citations (2)

Influence of establishment methods, irrigation water levels and weed- management practices on growth and yield of rice (Oryza sativa)

Indian Journal of Agronomy (2001)

Shantappa Duttarganvi R. Mahender Kumar B. K. Desai B. T. Pujari Kota Tirupataiah

A field experiment was conducted during rainy (kharif) and winter (rabi) seasons of of 201213 and 201314 at the Indian Institute of Rice Research (IIRR), Hyderabad, Telangana, in clay loam soils, to evaluate the influence of different establishment techniques, irrigation water levels and weed-management practices on productivity, growth and yield of rice (Oryza sativa L.). System of rice intensification (SRI) was significantly superior to conventional and mechanized transplanting for grain yield (6.10 and 6.47 t/ha), yield attributes like panicles/m2 (376 and 405), panicle weight (4.6 and 4.9 g), 1,000-grains weight (17 and 18 g) and growth parameters like leaf area (2,743.6 and 2,820.5 cm2/hill) and effective tillers/m2 (470 and 482) during kharif and rabi respectively, in both the years. Al- ternate wetting and drying (AWD) and cono-weeding recorded significantly higher growth and yield parameters over the other irrigation and weed-management practices, respectively, due to profuse root growth and aerated condition.

Kharif crop

Panicle

Transplanting

Puddling

Non-invasive ventilation

10.59797/ija.v61i2.4365

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Citations (4)

Determination of field water balance of paddy using drum culture technique

International Journal of Research in Agronomy (2024)

A Suryakala Karuna Sagar R. Mahender Kumar G. Pratibha Umamahesh

Water balance

10.33545/2618060x.2024.v7.i9sc.1449

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Citations (0)

Yield and Yield Attributes Influenced by Different Planting Methods and Nitrogen Treatments

International Journal of Current Microbiology and Applied Sciences (2017)

S. Praneeth D. Vishnu Vardhan Reddy R. Mahender Kumar P. C. Latha T. Ramesh

This paper examines the yield and yield attributes under different planting methods and nitrogen treatments. Yield attributes like panicle length, filled grain and unfilled grain percentage, test weight, grain yield, straw yield and harvest index performed well under system of rice intensification compared to normal transplantation. Among the nitrogen management practices 75% inorganic+ 25% organic (N5) treatment showed better performance compared to 100% inorganic (N6), 100 % organic (N2), 50% organic + 50% inorganic (N4), 75% organic +25% inorganic (N3) and control (N1). Grain yield was increased significantly by 18.3% under SRI over NTP. Among nitrogen treatments N5 enhanced 37.8% yield over N1.

Panicle

30-day yield

Test weight

10.20546/ijcmas.2017.608.366

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Citations (0)

Integrated Pest Management in Rice-Based Cropping Systems in India

Apple Academic Press eBooks (2022)

Gururaj Katti Ch. Padmavathi R. Mahender Kumar

Rice is the major staple food crop cultivated widely across diverse eco systems throughout India. In recent years, increasing scarcity of resource inputs coupled with other socio-economic constraints have posed serious challenges in achieving sustainable food production in India. Improved productivity and profitability through the identification of appropriate rice-based cropping systems seems to be the possible solution to mitigate these challenges. However, insect pests are the key biotic stresses posing hurdles in realizing the potential benefits of rice-based cropping systems. Five pests of national significance affecting rice crop yields along with impacts on climate change and its concomitant effects on the agronomies of rice-based cropping systems need to be tackled to ensure ecological, economic, and social benefits for rice farmers. A holistic approach of integrated pest management, with emphasis on biointensive inputs, offers a long-term, eco-friendly solution to the pest problems of this most important and prevalent cropping system of the country.

Cropping system

Scarcity

Staple food

10.1201/9781003304524-5

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Citations (1)

Assessment of Energetics of Rice with Irrigation and Nitrogen Management Practices under Different Establishment Methods

International Journal of Current Microbiology and Applied Sciences (2018)

I Thirupathi Ganga Sagar R. Mahender Kumar K. Surekha J.V.N.S. Prasad

A field experiment was conducted on a clay loam soil at Indian Institute of Rice Research (IIRR) formerly Directorate of Rice Research (DRR), Rajendranagar, Hyderabad, Telangana during the kharif seasons of 2015 and 2016 to study the “Assessment of production potential of rice with irrigation regimes and nitrogen management practices under different establishment methods”. The treatments consisted of three establishment methods Normal transplanting (NTP), Mechanized System of Rice Intensification (MSRI) and Drum seeding (DS) as main plot treatments, two irrigation regimes continuous flooding, Alternate wetting and drying at 5cm depletion as sub plot treatments and two nitrogen management practices (RDN - 100 % through inorganic and RDN - 75 % inorganic and 25 % organic) as sub-sub plot treatments summing upto 12 treatment combinations laid out in split-split plot design with three replications. Normal transplanting method required higher input energy. The gross energy output, net energy, energy use efficiency, energy productivity and energy intensity in economic terms recorded were significantly higher in MSRI than other establishment methods. Continuous flooding treatment recorded higher input energy, gross output energy and net energy. Energy use efficiency, energy productivity and energy intensity in economic terms recorded were higher with irrigation at 5cm depletion and these were at par with flooding method. The highest input energy consumed was with RDN (75 % inorganic and 25 % organic) management practice. The gross energy output, net energy, energy use efficiency, energy productivity and energy intensity in economic terms recorded were significantly higher with nitrogen application through RDN (75 % inorganic and 25 % organic) than inorganic N source.

Transplanting

Kharif crop

10.20546/ijcmas.2018.701.279

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Citations (2)

Influence of establishment methods, irrigation water levels and weedmanagement practices on growth and yield of rice (Oryza sativa)

Indian Journal of Agronomy (2016)

Shantappa Duttarganvi R. Mahender Kumar B. K. Desai B. T. Pujari Kota Tirupataiah

A field experiment was conducted during rainy (kharif) and winter (rabi) seasons of of 2012–13 and 2013–14 at the Indian Institute of Rice Research (IIRR), Hyderabad, Telangana, in clay loam soils, to evaluate the influence of different establishment techniques, irrigation water levels and weed-management practices on productivity, growth and yield of rice (Oryza sativa L.). System of rice intensification (SRI) was significantly superior to conventional and mechanized transplanting for grain yield (6.10 and 6.47 t/ha), yield attributes like panicles/m2 (376 and 405), panicle weight (4.6 and 4.9 g), 1, 000-grains weight (17 and 18 g) and growth parameters like leaf area (2, 743.6 and 2, 820.5 cm2/hill) and effective tillers/m2 (470 and 482) during kharif and rabi respectively, in both the years. Alternate wetting and drying (AWD) and cono-weeding recorded significantly higher growth and yield parameters over the other irrigation and weed-management practices, respectively, due to profuse root growth and aerated condition.

Kharif crop

Panicle

Transplanting

Puddling

Source

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Citations (6)