Browsing by Author "Rajaram, K P"
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Item 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 PAn 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.Item Leaching loss of nitrogen in waterlogged rice fertilized with different forms of urea(Kerala Agricultural University, 1995) Anilakumar, K; Rajaram, K P; Sivakumar, CItem Mineralisation pattern of applied urea in rice soils(Kerala Agricultural University, 1993) Anilakumar, K; Rajaram, K P; Johnkutty, I; Jose MathewA 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.Item Nitrogen losses from the rice soils of Kerala with special reference to ammonia volatilization(Department of Soil Science and Agricultural Chemistry, College of Horticulture, Vellanikkara, 1989) Anila Kumar, K; Rajaram, K P