Angus, J.F. and Hasegawa, S. and Hsiao, T.C. and et al, . (1983) The water balance of post-monsoonal dryland crops. Journal of Agricultural Science, 101 (3). pp. 699-710.
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Abstract
6 dryland crops (mung beans, cowpeas, soyabeans, groundnuts, maize and sorghum) and rice cv. C-171-136 and IR36 were grown under rainfed and irrigated conditions on a dryland site with a clay loam soil. After the first 30 days of growth there was no effective rain and the rainfed crops encountered different water deficits. Crop productivity, leaf area, plant water status, root distribution and soil water use were measured. Neither rice cv. yielded seed under rainfed conditions, but all other crops did. With mung bean and cowpeas there was little difference between the yields under rainfed and irrigated conditions, but groundnuts, soyabeans, sorghum and maize gave higher yields under irrigation. The rainfed crops extracted different amounts of stored soil water, ranging from 100 mm for IR36 to 250 mm for groundnuts. The different amounts were associated with different growth durations, rooting depths and rates of soil water depletion from within the root zone. Biological productivity of the 6 rainfed crops with the C3 photosynthetic pathway was linearly related to transpiration, which was estimated from soil water extraction and soil evaporation. Biological productivity/unit of transpiration for the 2 crops with the C4 pathway was 2.2 times higher than for those with the C3 pathway. The different seed yields of the rainfed crops were due to differences in harvest index and the chemical composition of seeds, as well as to biological productivity. The results are discussed in relation to the potential for growing dryland crops after rice in rice-based cropping systems
| Item Type: | Article |
|---|---|
| Author Affiliation: | IRRI, Los Baños, Philippines |
| Subjects: | Plant Production |
| Divisions: | Groundnut Maize Sorghum Soyabean |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 22 Nov 2012 03:43 |
| Last Modified: | 22 Nov 2012 03:43 |
| Official URL: | http://dx.doi.org/10.1017/S0021859600038739 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/8856 |
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