| The field experiments for limitted irrigation of spring maize was carried out in Linze ecosystem research station of CAS cold and drought institute from April to September in 2008. This paper mainly studies the water consumption pattern, soil moisture dynamics, crop-growth dynamics, physiological index, water use efficiency, irrigation water use efficiency, yield effect, economic benefit, and so on. Four treatments T1(642mm), T2(666mm), T3(777mm) and CK(897mm) based for the different irrigation quotas in the whole growth stage were applied. The results were as follows:1. The amount of water consumption of spring maize was less at the early stage, more at the middle stage and declined again at the later stage in the whole growth stage. The water consuming intensity of spring maize was a bimodal curve, and the first peak was between jointing and booting, and the highest was 9.59 mm·d-1, the second peak was between Tasseling and silking, and the hightest was 12.49mm·d-1. The highest water consumption coefficient of spring maize in the whole growth stage was between filling and milk stage, the average value was 24.40%, the lowest was 5.32% between seeding and jointing.2. The change of height increased relatively slowly from seeding and jointing to jointing and Tasseling, increased rapidly and reached maximum between Tasseling and silking, and was basically stable in filling stage. CK was the hightest in each growth stage, and T1 was the lowest in each growth stage. There were no significant differences before jointing stage, and were significant differences after jointing stage.3. The LAI of spring maize was a single peak curve, and the hightest value was in filling stage. There were no significant differences in seeding, jointing and filling stages, until to the middle filling stage The LAI of spring maize has the greatest difference, and CK increased 18.31%, 16.87%, 8.44% with T3, T2 and T1 respectively.4. The change curve of dry weight of single plant in the whole growth stage was a s-type. There were no significant differences before silking stage, and there were significant differences after filling stage, and each treatment reached the hightest value in maturity. CK increased 19.76% compared to T1. The Variation of dry matter accumulating rates was a bimodal curve. There were no significant differences before 120d, and were significant differences between 120d and 150d, CK increased 43.2% compared to T1.5. The 100-grain fresh weight after 0-7d of pollination increased most. The fresh weight of T1, T2, T3, CK increased 1.96g, 2.43g, 1.64g, 2.03g per day respectively, and reached the hightest value at the 37th day. The grain filling rate was a single curve, and the hightest filling intensity of T3 and CK was 5 days in advance compared to T1 and T2, which were 1.41g and 1.16g respectively. The relationship between 100-grain fresh weight, 100-grain dry weight and the day after pollination were cubic polynomial equation.6. Through analyzing the economic benefit of spring maize, T3 has the hightest net income. 7800m3/hm2 can be popularized and applicated under the local agricultureal production cultivation and technical conditions is fit for the oasis spring maize in the whole growth stage in the study area by considering economic benefit and field practical operation.
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