The effect of fertilizer use on the variablility of barley yields in dry areas. Discussion Paper no. 17.
1986
Somel K.
In a study to measure the effect of fertilizer use (N and P) on the variability of barley yield in dry areas, it was found, that fertilizer use reduces variability in barley yields under rainfed conditions in dry areas and substantial gains in yields are possible along with reductions in variability. Improved cultural practices, with emphasis on fertilizer use, improves the efficiency of use of the most critical limiting factor: water. Fertilizer use improves water use efficiency without increasing water use. Increased root growth an early plant establishment allow increased transpiration and reduce evaporative losses from the soil surface. Furthermore, maturity is advanced and this provides an escape mechanism from the drought stresses that invariably occur at the end of a season. These can be identified as the principal factors that reduce the variability of yields.
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