Effect of phosphorus with and without zinc on wetland rice
1989
Buntan, A. | Gunarto, L. | Rauf, M. | Corpuz, I.T. (Maros Research Inst. for Food Crops, Ujung Pandang (Indonesia). Agronomy Dept.)
Data from the 1981 and 1982 dry season (DS), long-term soil fertility trials at Lanrang Substation [India] showed that application of Zn significantly decreased rice grain yields. Responses to phosphorus also were observed. An experiment in the 1984-85 DS (Nov-Feb) was designed to determine yield response of rice to different P rates, with and without Zn. The clay loam soil had pH 5.9 (slightly acidic); 2.6% organic matter content (low); 9 ppm available P (medium); 13.8, 8.8, 0.8 meq exchangeable Ca, Mg, K/100 g soil (adequate). P, N, and K were applied in the form of TSP, urea, and KCl, respectively; 100 kg N/ha and 50 kg P/ha were applied as basal. Treatments were arranged in a randomized complete block design with four replications. ZnO at 5 kg/ha with P rates ranging from 13 kg P to 66 kg P/ha in 13-kg P increments did not significantly affect grain and straw yields of IR54. There were no significant differences between P with and without Zn and there was no response to phosphorus.
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