Analysis of irrigation water requirement for maize and soybean in Siping region of Jilin Province
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Abstract:
Temporal distributions of precipitation and water requirements of maize and soybean during the growth period in Si 2 ping region were analyzed. Crop water requirement was computed using the Penman2 M onteith equation ( FAO 56 PM formula) and crop coefficients. Effective precipitation and water requirements ( ET c )for maize and soybean sin different hydrological years were analyzed using the P 2III distribution curve. Results showed that the average effective precipitation, water requirement ( ET c ), and water deficit are 423. 24, 503. 73, and 80. 49 mm respectively for maize, and 442. 62, 484. 18, and 41. 56 mm respec 2 tively for soybean in Siping region. During the wet year ( P= 25%) , normal year ( P= 50%), and dry year ( P= 75%), the effec 2 tive precipitation is 517. 47, 425. 60, and 352. 79 mm respectively, and the corresponding water requirement is 504. 88, 467. 83, and 506. 29 mm respectively for maize; whereas the effective precipitation is 540. 23, 452. 26, and 371. 42 mm respectively, and the corresponding water requirement is 434. 67, 498. 80, and 450. 77 mm respectively for soybean. Supplementary irrigations at the fast development stage of maize and at the blossom and productive stage of soybean are important for maintaining high yields in Siping region.
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