Abstract
The influence of 3 organic manures (farmyard manure, coir pith compost and in situ green manuring using sunhemp) and 3 levels each of N and K (40, 80, 120 kglha) on nutrient uptake and nutrient use efficiency of white yam (Dioscorea rotundata) intercropped in coconut (Cocos nucifera L.) garden was studied during 1998 2000) at Vellayani, Thiruvananthapuram. Application of coir pith compost resulted in significantly higher uptake of N and K. Higher rates of N and K favoured uptake of N, P and K by the crop. An intercrop of white yam in coconut garden fertilized with coirpith compost 5 tonneslha and N, P and K 80, 60 and 80 kglha respectively, yielding 24.61 tonneslha of fresh tuber equivalent and 7.36 tonneslha of dry matter removed 89.59, 10.10 and 92.99 kglha of N, P and K respectively. The agronomic efficiency of N and K fertilizers was promoted due to green manuring. En hanced supply of N or K reduced the efficiency of the respective nutrients, whereas addition of one nutrient at higher rates promoted the efficiency of the other nutrient.
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