Grain and straw yields, number of fertile tillers, plant height, paddy to straw ratio and thousand grain weight of rice cv. IR-6 increased by apply-ing copper (5 and 10 kg ha-I) and zinc (10 and 20 kg ha-1) either alone or in combination with NPK (100-50-50 kg ha-1) to the soil marginal in available zinc and copper. The treatment compris-ing 20 kg Zn - 1 plus 5 kg Cu ha 1 proved superior to all other treatments except 20 kg Zn plus 10 kg Cu ha 1 in respect of paddy yield. Analysis of paddy and straw indicated a decrease in phos-phorus but increase in nitrogen and potassium concentrations by applying the micronutrients in soil. Copper and zinc inhibited the concentration of each other in both straw and paddy.
Manzoor Qadir, Iftikhar Ahmad , Atta Muhammad Ranjha. (1988) Response of wet land rice to copper and zinc in the presence of NPK, , Volume 25, Issue 4.
