The Study Of Maize For Seed Under Micro-moist Irrigation Pattern

Seed maize micro-moist irrigation field experiment was carried out during April October months in2011in zhangye key experiment stations, four treatments was set up on the basis of the combination of micro-moist irrigation technical parameters, namely buried deep12cm,spacing40cm pressure0.045MPa (T1);buried deep12cm, spacing60cm, pressure0.06MPa (T2); buried deep18cm, spacing40cm,pressure0.06MPa (T3); buried deep18cm, spacing60cm,pressure0.045MPa (T4), except that drip irrigation (CK1) and border irrigation (CK2) for comparison.Through studied of the change of soil temperature and soil water during the growth period of maize, include WUE and yield effect, to find out the best combination mode of micro-moist irrigation technical parameters. The results show that:1At14:00, the surface temperature change in one day, the biggest change with depth ground temperature curve decision coefficient and changing the birth period of T1and T2which was smaller buried depth under micro-moist irrigation, were more than T3and T4treatment which is bigger buried depth, but changes of one day curve decided coefficient of T1and T2less than T3and T4; At08:00and20:00, the biggest change with depth ground temperature curve decision coefficient of T1and T3which was smaller buried spacing under micro-moist irrigation. The temperature at08:00and20:00of T1and T4which was smaller pressure was bigger than T2and T3.2At08:00, the temperature of micro-moist irrigation was higher than the drip irrigation and border irrigation; at14:00, the range of temperature was the largest in three times of a day from5-25cm soil. The combination mode of the micro-moist irrigation had very big effect on the change of soil temperature both in time or space.3During the whole growth periods, the soil moisture of all treatments change trends was reduced at first and then increased,at last reduced again,the peak appear at the period of pustulation. The soil moisture of CK1and CK2always was higher than micro-moist irrigation in the whole growth period.Before heading stage, the soil moisture of all treatments were increased with soil depth; after heading stage, the soil moisture of all treatments were decrease with soil depth.4During the whole growth periods, the stage consumption water of each treatment was biger during seeding-jointing stage and pustulation-milking period than other stages. All treatments in seedling stage the water strength changed quietly, and no distinct difference;From the jointing stage the change was more clear. Drip irrigation and border irrigation water strength greater than the micro-moist irrigation water strength during sprouting stage;but it was the opposite during postulation stage. Maize growth period was delayed due to water insufficiency of micro-moist irrigation.5Border irrigation and drip irrigation water module had been increasing in seedling stage and had reached maximum in postulation stage, then it had decreased in milking stage. Micro-moist irrigation is the largest in seedling stage, it had declined from the seeding stage until sprouting stage, it down to the lowest,then creased in postulation stage and dropped in milking stage.During the whole growth period, the border irrigation and drip irrigation water module was very significant difference, at the same time the two compare treatments water module respectively was very significant difference with the micro-moist irrigation, other treatments between micro-moist irrigation the water module was not very significant.6The dry matter is small in seedling stage, there is no significant difference and very significant difference. The dry matter of micro-moist irrigation was less than drip irrigation and border irrigation in jointing stage, and there is very significant difference but there is no significant difference between drip irrigation and border irrigation. The dry matter of each treatment did not exist significant differences in sprouting stage. Into the milking stage, the dry matter of T3and T4exist significant differences with drip irrigation and border irrigation; the dry matter of T4still have significant differences compared to drip irrigation and border irrigation in mature stage, but the dry matter of T3rapidly increased during milking-mature stage and eliminated significant differences with with drip irrigation and border irrigation; the dry matter completed until mature stage. The results show that:shallow buried depth can improve maize plant high growth, small spacing can improve dry matter accumulation.7The maize yield of micro-moist irrigation have very significant difference with drip irrigation and border irrigation;there is no very significant difference but significant difference between drip irrigation and border irrigation. The highest water use efficiency was micro-moist irrigation, the second was drip irrigation and the lowest was border irrigation. The water saving rate of micro-moist irrigation was35.81%compared with drip irrigation. Compared with the border irrigation, the water saving rate of micro-moist irrigation was63.35%, the water saving rate of drip irrigation was42.91%. The correlation coefficient of the seed number per ear heavy and grain weight per production with yield was higher; the correlation coefficient of convex pointed degree with yield was negatively correlated. Spike weight and grains per ear are important factors which affected maize yield.8The micro-moist irrigation methods is the most water saving irrigation,the best pattern was which was12cm, spacing was40cm, the pressure was0.06MPa.