| The soil temperature change rules, soil moisture of maize, irrigation effect and yield in the whole growth periods, in drip irrigation under plastic film cover. The results showed as follow:1. During the whole growth periods, storage water change rules, the maize for drip irrigation under plastic film mulch, the trends was increased at first and then reduced, the peak appear at the period of tassel. Water moisture content of plots for drip irrigation under plastic film mulch always was higher then the normal irrigation treatment. Water moisture content of the normal irrigation for maize always shows the trend of reduce until from grouting to ripe period, the water moisture content would rise. Along with the deeper of the soil layer, there were no differences in soil moisture contents between irrigation quotas (P > 0.05) in drip irrigation under plastic film conver.2. Consumptive use of maize under drip irrigation throughout the whole period showed that: small amount during growth prophase, large amount during metaphase, and a bit of smaller during anaphase. The total water consume amount of each treatment was increase by the increase of irrigation quotas for the corn under drip irrigation during the whole growth periods, water storage in soil was linear ratio with irrigation quotas, teatment CK1 is the maximum, then T1>T2>T3>T4.3.Consumive use of maize is gradually increase under drip irrigation under plastic film mulch shows from tassel to grouting period, water consume intensity reach up to the maximum; during the period of grouting to milky ripeness the intensity of consumptive use is no diffrences, but the effects of water irrigation affect was significantly. There was significantly on water consume modules of each treatment during the whole growth period in drip irrigation for maize, but the maximum at the period from grouting to milky ripeness, count for 28.89%, jointing to bell mouth period was only 9.36%, it is the minimum in the whole growth perioud.4. The daily change trend of soil temperature at 5 cm and 10 cm soil layer from soil surface were with the deadly of time each treatment, it was increase until reach up to the highest point and then reduce; 15cm, 20cm, 25cm depth the temperature of soil is slowly increased from 8:00 to 20:00. From 8:00 to 20:00, the change rules of soil temperature is T5cm >T10cm>T15cm>T20cm>T25cm in each treatment. Whether the shallow layer of soil or the deep layer of soil, from 8:00 to 20:00, each treatment at different time, soil temperature were inverse ratio with water irrigation amount. Within a day, the surface temperature of soil is rising during 8:00～16:00, the rest time temperature is reducing. For the deeper layer of soil, the change rules of each treatment is slowly rising from 8:00, and the period and time of maximum variety were delayed for soil temperature than the shallow layer.5. The soil temperature of treatments during the whole growth of maize show the trend of reduces to increase to reduce. The maximum variety of soil temperature was reduce with the soil depth increased at 5～25cm depth. For different time, the maximum variety of soil temperature took place at 14:00, the minimum variety took place at 8:00 and 20:00. Irrigation quota were change on affects of soil temperature and the soil depth, soil temperature variety and soil depth relativity reduce with the increase of irrigation quota. In each growth stage, soil temperature increase fastest at 8:00～10:00 in all treatments, soil temperature reduces rapidly at 18:00～20:00, and there is no difference.6. The change of plant height rapidly increases at prophase, slowly increase after jointing period, basically stable at grout period anaphase. At growth prophase and anaphase of maize under drip irrigation, irrigating amount has a little influence on plant height, but during the metaphase, difference of plant height for maize can reach up to 26.6 cm among each treatment. During the whole growth period, dynamic change of leaf-area shows the singlet curve in all treatments. During the prophase and metaphase, leaf-area value changes rapidly, but during the anaphase, leaf-area changes slowness.7. From the analysis of variance, the yield of each treatment has no difference. Consumptive use is 457.8 mm, and WUE was 3.174 kg/m3 and irrigation water use efficience was 6.885 kg/m3, it was the highest in all treatments. Therefore, treatment 3 were the most on economic benefit and water saving in all treatments. The inclusion was maize irrigation amount 2100 m3/hm2 under drip irrigation with plastic film mulch for Wuwei.
|
PDF Full Text Request