تلخیص
The soils of Pakistan are recognised to be deficient in available nitrogen (N),phosphorus(P) and zinc(Zn) but are believed to be adequate in copper(Cu). However, in certain soils application of zinc along with N and P fertilizers does not result in sizeable increase in crop yield. Application of these fertilizers to rice soils may induce Cu defeciency or it may enhance Cu requirement of rice at reproductive stage and hence may limit yield. Greenhouse pot experiments were conducted to test the hypothesis and ascertain the effect of Cu application on paddy yield. The result showed that on zinc deficient soils, application of Zn along with N reduced paddy yield drastically compared to N alone while the straw yield was not affected. The reduced paddy yield could be attributed to decreased number and weight of grains and low percentage of filled grains per panicle. Application of Cu along with Zn significantly increased the~paddy yield over control or Z.n alone application as well as Zn and Cu uptake by the plants. Therefore, addition of small amounts of Cu along with Zn should be encouraged to get optimum rice response from costly N and P fertilizer application.
S.M. Alam,, A. Latifand Zafar Iqhal1. (1997) RESPONSE OF RICE TO NITROGEN AND ZINC FERTILIZATION WITH OR WITHOUT COPPE, The Journal Soil & Environment , Volume 13, Issue (1-4).
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