Quantitative relationships between irrigation requirement and wheat yield grown on a desertic sandy soil in Saudi Arabia

Sabrah, R.E.A.; Magid, H.M.A.; Aal, S.I.A.; Rabie, R.K.; Kalifa, A.Y.

Egyptian Journal of Soil Science 39(1): 1-12

1999


Accession: 003539743

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Abstract
A field experiment of two successive seasons of wheat was carried out on a sandy soil in the central region of Saudi Arabia, under sprinkler irrigation. The effect of irrigation requirement on growth characteristics, nutrient uptake, yield components and yield quality of wheat were studied. The quantitative relationship between the grain yield (Y) and irrigation requirement (IR) was calculated and the economical use of irrigation water was estimated. The results indicated that: the reduction of IR by 25% from the recommended level (700 mm ha-1) induced a significant reduction in dry weight of plants as well as nutrient uptake. Water deficit caused the highest damage when the grain, straw and protein yields are considered, resulting in yield reductions of 26.0 to 31.6%, 24.6 to 29.5% and 15.0 to 24.6% respectively; and grain yield was correlated significantly to IR, and the cubic relationship fitted the data best. The optimum level of irrigation water was 850 mm ha-1 season-1 under the conditions of this study. Economic analysis indicated that the optimum IR which reflects the economic efficiency of IR resources is 875 mm ha-1 season-1. A linear model of this relationship showed that the initial yield point (IYP) is ~171 mm and the marginal increase in yield per unit increase of irrigation water (dY/dIR) varied between 9.16 and 9.91 kg ha-1 mm-1 for both seasons.