Wheat response to soil-P content in the central highlands of Yemen
1988
Saad, H.S. | Bamatraf, A. | Haidra, A. (Agricultural Research Authority, Taiz (Yemen Arab R.))
Field study was conducted with the objective of correlating wheat yield with available phosphorus content of the highly calcareous soils in the central highland of Yemen. Wheat straw and grain yield increased four times with increasing phosphorus applications (0 to 240 P2O5 kg/ha). The yields tripled when 80 kg/ha of P2O5 was added but there were no significant yield differences with the increasing dose. Available phosphorus (NAHCO3 - extracted) content in the soil increased consistently with increasing added phosphorus. Wheat yield response was highest when soil phosphorus content reached an average value of about 13 ppm. Although increasing soil P over this level did not result in significant yield increments, available phosphorus removal by wheat crop was higher as P level in the soil increased
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