Use of green manures as nitrogen sources for wet seeded rice
1995
Kundu, D.K. | Rao, K.V. | Pillai, K.G. (Directorate of Rice Research, Rajendranagar Hyderabad 500030, Andhra Pradesh (India))
Fresh loppings of Gliricidia sepium and Ipomoea carnea were evaluated as N sources for wet seeded rice cv. Rasi in an N-deficient Vertisol at Hyderabad, India, for three seasons during 1991-92. Urea applied in two to three splits and neem-coated urea in a single basal dose or two split doses were the reference N sources. Rice seeded at 50, 75, and 100 kg/ha produced comparable yields and N uptake. Incorporation of green manures into puddled soil 2 d before sowing of pregerminated seeds temporarily inhibited early growth of rice seedlings. The plants, however, overcame this stress within 10-12 d and grew normally thereafter. At equal N application rate, the green manures were as effective as urea and neem-coated urea in increasing rice yields. Each kilogram of green manure N produced 16-18 kg rice grain in wet season and 21-25 kg in dry season. Mean crop recovery of 100 kg N/ha supplied through green manures was either comparable with or higher than that from urea applied in three splits. KCl-extractable N in the soil was comparable in green manure- and coated urea-treated plots at 3 wk, but considerably higher in green manure plots at 6 wk after seeding. Green manures could be effective N sources for wet seeded rice
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