Browsing by Author "Anilakumar, K"

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Changes in nutrient availability and uptake in transplanted rice under shallow and deep submergence
(Kerala Agricultural University, 1994) Anilakumar, K; Johnkutty, I; Menon, P K G; Sivakumar, C
Field experiments were conducted to study the changes in electro-chemical properties and nutrient availability in soil and soil solution in transplanted rice during kharif and rabi season under deep (20 cm) and shallow (10 cm) submergence, respectively. The pH of soil and soil solution increased up to 30 days after transplanting (DAT), then decreased and again increased slightly at 50% flowering stage. Redox potential of soil decreased rapidly during kharif season while during rabi season, the values increased up to 30 DAT and thereafter stable values were recorded. Concentration of nutrients in soil and soil solution decreased with crop growth except in the case of soil P during kharif season and soil solution Ca during both the seasons. Availabilit y of nutrients in soil and soil solution except for P and Mg was more during kharif season, while the nutrient uptake was higher during rabi season. Application of P and K during rabi season was effective in areas where P and K were applied once in two seasons. Significant difference in yield was obtained only during rabi season.
Effect of NPK fertilizers on the availability of micronutrients in submerged laterite rice soils of Kerala
(Kerala Agricultural University, 1992) Anilakumar, K; Hassan, M A; Johnkutty, I; Menon, P K G
Effect of organic sources on nitrogen availability in flooded rice soils
(Kerala Agricultural University, 1989) Anilakumar, K; Johnkutty, I; Hassan, M A; Menon, P K G
A study was conducted during the rabi season of 1982 to study the changes of N in the lateritic rice soil as well as in the rice plant as influenced by flooding in the presence of various organic and inorganic sources of nitrogen. The results revealed that daincha treated plots were able to liberate more nitrogen in the soil as well as in the solution than farm yard manure or azolla treated or urea alone treated plots. In general the NH4-N content in the soil showed a progressive decrease from tillering to harvest (11.13 - 1.99 ppm). The chemical kinetics of NOj-N, hydrolysable-N, non-hydrolysable N, organic carbon and total N were not influenced by the various treatments. Urea applied alone or in combination with daincha was found better for increased N uptake by the rice plant.
Effect of phosphorus and sulphur on growth, yield and nutrient uptake of rainfed upland cowpea
(Kerala Agricultural University, 1998) Gracy Mathew; Sreenivasan, E; Anilakumar, K
A field experiment was conducted during kharif 1992-94 in a sandy loam acid laterite soil to study the effect of graded doses of phosphorus and sulphur on the yield and nutrient uptake of rainfed cowpea (Vigna unguiculata [L.j Walp). The different levels of phosphorus showed significant difference in the yield and nutrient uptake of cowpea. Maximum grain yield and nutrient uptake was obtained with application of 60 kg P3O5 ha'1. The net return was also highest with this level of phosphorus nutrition. Application of sulphur did not show any remarkable influence on growth, yield and nutrient uptake of cowpea.
Effect of urea forms on ammonia volatilization, n recovery and yield of lowland rice in sandy and laterite soils
(Kerala Agricultural University, 1993) Anilakumar, K; Rajaram, K P
An experiment was conducted to identify the best urea form which allows minimum N loss through ammonia volatilization but simultaneously ensuring good yield in the sandy and laterite soils of Kerala. The sulphur coated urea and urea mudball deep placement recorded minimum N loss through ammonia volatilization (2.85% and 5.29% respectively, of the applied N). However, application of urea supergranu lei n the reduced zone recorded the maximum grain yield and N recovery. Though the rate of ammonia volatilization was comparable between the two soils, yield was higher in laterite soil, irrespective of the treatments.
Kinetics of silicon in relation to different levels of major nutrients in the lateritic flooded rice soils
(Kerala Agricultural University, 1990) Anilakumar, K; Johnkutty, I; Hassan, M A; Menon, P K G
Leaching loss of nitrogen in waterlogged rice fertilized with different forms of urea
(Kerala Agricultural University, 1995) Anilakumar, K; Rajaram, K P; Sivakumar, C
Long term effect of continuous fertilization by organic and inorganic sources on rice productivity
(Kerala Agricultural University, 1993) Anilakumar, K; Johnkutty, I; Kamalam Joseph
Pooled analysis of grain yield data for25 years (1961 to 1985) generated from a permanent manurial experiment with tall indica rice varieties revealed that during the first crop season (kharif), the treatment receiving combined application of cattle manure and NPK was significantly superior to others. The above treatment was on par with combined application of cattle manure, green leaves and NPK during the second crop season (rabi). The increases in yield by the former treatment over NPK alone were 7.6 and 5.6 per cent respectively during kharif and rabi seasons.
Mineralisation pattern of applied urea in rice soils
(Kerala Agricultural University, 1993) Anilakumar, K; Rajaram, K P; Johnkutty, I; Jose Mathew
A laboratory incubation study was conducted to find out the pattern of transformation and mineralisation of applied urea under submerged condition in the three major rice soils of Kerala. The hydrolysis of urea to ammonium was influenced by the soil reaction and organic matter content. The formation of oxidised N products like nitrate and nitrite was meagre due to lack of adequate oxygen to carry out the process of nitrification. This avoided the chances of N loss through denitrificalion in the waterlogged rice soils.
Nirtrogen nutrition and yield of rice (culture 1727) at different levels of major nutrients
(Kerala Agricultural University, 1993) Anilakumar, K
In a fertilizer management experiment conducted during 1988 crop seasons with different levels of N, P and K, it was observed that 50 kg N/ha was sufficient for the rice cultivar Culture 1727 from the point of view of economics and nitrogen use efficiency, in laterite soil with low available nitrogen status. Application of different levels of N, P and K did not show any marked effect on the grain and straw yield. Plant nitrogen content decreased and uptake increased up to 50 per cent flowering. Maximum nitrogen uptake was observed in between 30 to 40 days after transplanting. Better utilization of nitrogen was observed during the second crop season (Oct-Jan).
Response of rice to phosphorus solubilising bacterial culture for its P utilisation under waterlogged condition
(Kerala Agricultural University, 1996) Anilakumar, K; Gracy Mathew
The response of P solubilising bacterial culture to waterlogged rice was evaluated in a field experiment. The bacterial culture had no effect on P availability in soil and P uptake by plants at any stage of crop growth There was no marked advantage for the bacterial culture on yield or in reducing the recommended dose of P to waterlogged rice where there is little response to applied P.
പൊക്കാളി കര്‍ഷകസംഗമവും നിര്‍ദ്ദേശങ്ങളും
(Kerala Agricultural University, Vellanikkara, 2008) Anilakumar, K; KAU