Yield and P uptake by wheat as affected by P fertilization and soil moisture regime

Autor: NT Singh, AC Vig
Rok vydání: 1983
Předmět:
Zdroj: Fertilizer Research. 4:21-29
ISSN: 1573-0867
0167-1731
DOI: 10.1007/bf01049663
Popis: The influence of different moisture regimes and the method of phosphate application on the availability and uptake of native and fertilizer P by wheat (Triticum aestivum L.) was studied in a field experiment on sandy loam soil low in available P. Phosphorus application up to 39 kg ha−1 signficantly increased wheat yield irrespective of the method of application. Wheat yield with drill application of 26 kg P ha−1 was almost equal to that with broadcast application of 39 kg P ha−1. A mean increase of 230 kg ha−1 grains was obtained, when P fertilizer was drilled below seed. The relative efficiencly of placement was found to be 1.4 times that of broadcast method. The increase in IW/PAN-E ratio from 0.6 to 1.0 significantly increased grain yield. Scheduling of irrigation at narrow IW/PAN-E ratio but with fertilizer placed gave almost the same yield as was obtained with irrigation scheduled at IW/PAN-E equal to 1.0 and P fertilizer broadcast. Total P uptake by wheat was greater under wetter moisture regimes. The uptake of applied P decreased with increase in soil moisture regime, while that of soil P tended to increase with frequent irrigation. The uptake of soil P was a linear function of moisture supply and under conditions of this experiment P uptake by wheat beyond a P dressing of 20 kg ha−1 was limited by soil water.
Databáze: OpenAIRE
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