Irrigation scheduling of snap beans grown in plastic houses in Jordan [irrigation production function; development of crop coefficient for optimal scheduling of irrigation]
1990
Oweis, Th.Y. | Ghawi, I. | Shatanawi, M.R. (Jordan Univ., Amman (Jordan))
Yield response of snap beans grown in plastic houses, in the Central Jordan Valley, to different levels of irrigation was studied. Transpiration rates over the growing season were determined and used with evaporation from class-A pan to develop weekly crop-pan coefficients for irrigation scheduling. The snap beans yield ranged from 8.12 tons/hectare (t/ha) using 120 mm of water to 19.1t/ha using 316 mm of irrigated water. The results showed that the irrigation production function is quadratic with maximum possible production of 19.6t/ha attainable with a net amount of 378 mm of water. Water Use Efficiency (WUE) was 0.06t/ha-mm at high production level and 0.08t/ha-mm at low production level. Crop pan coefficients (Kcp) ranged from 0.15 during the planting week to over 0.8 at maximum plant activity, after which it dropped to about 0.6 at the end of the season. Irrigation production function, together with the crop-pan coefficient curve, could be used to determine optimal irrigation levels and timing for snap beans grown in plastic houses; these can also be used for planning national water resources allocation for irrigation
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