Phosphorus placement effect on yield and P uptake by corn under rainfed conditions
2004
Amin, R. (National Agricultural Research Centre, Islamabad (Pakistan). Oilseed Research Programme) | Zaidi, A.H. | Khan, R.U. | Raza, G.H.
Two experiments were conducted to determine the effect of different rates and methods of phosphorus application on yield and P uptake by corn (Zea mays L. c.v. Azam) under rainfed conditions. The sites were moderately calcareous having relatively high soil P test values. Grain, cob and stalk yield responded positively to all rates of P application. Band application of P (30, 45 and 60 kg/ha) was better method during 1989 and 1990, while no difference was found at 15 and 75 kg/ha during 1989 and 75 kg/ha during 1990 regarding grain yield. Similarly cob yield was significantly increased by banding all P rates (1990), which was not true during 1989. Stalk yield was not improved by banding in both the experiments. All P rates increased P uptake in grains during 1989, while high rates of P (45, 60 & 75 kg/ha) were better during 1990. No significant difference in P uptake by rain was observed when P was applied by either method in 1990. P uptake by cobs was only increased when P was banded at 45 and 60 kg/ha during 1989 and 1990, however, in stalks, it was not affected by either rates or methods of P application during 1989 though improved by high rates during 1990.
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