| This paper mainly in the membrane application of drip irrigation in planting crops wheat launches the research, realize under Mulched Drip Irrigation in the application and popular ization of wheat through wheat research under the membrane under drip irrigation water-saving and yield increasing mechanism. By analyzing the different planting patterns and different irrigation on crop growth index, root development, in each growing stage of consumption of water and grain yield, simulation of under film drip irrigation of wheat under water and fertilizer salt migration using Hydrus model, again using the DSSAT model imitative screening reasonable irrigation system Finally, the water-saving irrigation system under the condition of film drip irrigation was formed, which provided the theoretical basis and technical support for the development of water saving irrigation in arid area and the increase of grain income.Hetao Irrigation District in Inner Mongolia as one of the main wheat producing area, Hetao Irrigation District in Dengkou test base were selected. Selection of the local main planting varieties of good 4 for the study, in2014 and 2015 conducted in-depth study, the following results were obtained:1. The plant height, dry matter and photosynthetic indexes of drip irrigation under film of wheat were higher than CK, and the 5 elements of the film showed obvious advantages, and the irrigation treatments were significantly higher than those of mild water deficit and moderate water deficit. The root distribution of the root system of wheat under film drip irrigation was more than 60% of the total root system in the soil layer of 0-30cm During the whole growth period of subintimal drip irrigation on wheat root growth index were higher than that of CK, a film of 5 lines rows of wheat with the root growth index were more than,a film line 6, in 0-30cm soil layer in the root of wheat growth indicators of the size and amount of irrigation is proportional to, and in 30cm soil and irrigation water amount is inversely proportional. In mature stage, when the root was withered, the amount of irrigation was not obvious, and the amount of irrigation was less than that of roots.2. The water consumption intensity and water consumption modulus of the wheat in the heading stage were the biggest in the heading stage, and the water consumption was about 40% of the total water consumption. The water consumption intensity of the whole growth period was similar to that of the water consumption modulus, and the process was changed from low to high to low. Wheat consumption of water and irrigation is proportional to, and CK in the whole growth period of water consumption is greater than the drip irrigation under film of wheat in 2014 is 17.72%,2015 for 23.43%; and a film of 6 lines, water consumption is higher than that of a film of 5 lines water consumption in 2014 to 3.4% in 2015 was 4.8%.3. Drip irrigation under film of wheat significantly higher than CK of water～saving and yield increasing effect,2014 and 2015 yield were increased by 16.21% and 17.93%; water use efficiency were increased by 31.15% and 37.13%; irrigation water productivity were increased by 37.81% and 40.09%. And under film drip irrigation of wheat with different planting patterns for a film of 5 lines optimal,2014 and 2015 film 5 yield more than a film of 6 lines to 3.81% and 3.60%; crop water use efficiency respectively 7.11% and 8.38%; irrigation water productivity respectively 8.36% and 7.03%.4. HYDRUS-1D after the test can be a very good simulation of a film of 5 lines and 6 lines of the various stages of the soil moisture, EC value, available nitrogen, available phosphorus changes. A film of 5 lines planting pattern for membrane under drip irrigation of wheat moisture effect more obvious; irrigation quantity the more conducive to drip irrigation under film of wheat desalination, a film of 6 lines is a film of 5 lines lines more easily salt accumulation phenomenon in below 40cm; irrigation effect on the size of the available nitrogen downward migration speed rate and planting patterns on soil available nitrogen, available phosphorus migration impact larger, a film of 6 lines, no available nitrogen, available phosphorus leaching, a film of 5 lines more easily deep leaching of available nitrogen, available phosphorus, a film of 5 lines is more fertilizer saving potential.5.DSSAT model of drip irrigation under film of wheat growth period and yield simulation more accurate, comprehensive consideration of crop high yield, degree of conservation of water resources, the suitable planting pattern finally comes to the conclusion that a film 5 lines of T9, the irrigation quota is 270mm, during the whole growth period, a total of irrigation 7 times, elongation stage 2 times respectively 45mm and Heading 3 times respectively is 45mm, filling stage 2 times respectively is 22.5mm; yield simulation 6404 kg·hm-2, water use efficiency 1.64 kg·m-3 for proper membrane of the Hetao area under drip irrigation of wheat, the optimal irrigation system... |
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