Expeimental Study On The Subsurface Drip Irrigation Key Factorseffect In Lathyruslatifolius

Since the implementation of the Yulin area, returning farmland to forest (grassland) and closing hillsides to facilitate grazing, Caoxu industry has undergone a qualitative change from the traditional grazing mainly to grass and artificial breeding shed, and adhere to the grass-animal, grass Livestock industry showing a strong momentum of development. In this study, the Yulin area, shortage of water resources, the climate is arid, wind, evaporation strong, little precipitation, poor water conditions, the characteristics of the short frost-free period, through the design of the three irrigation (90,180,270m3/hm2), three Drip with spacing (60,100,140cm) and three with drip irrigation depth (10,25,40cm), the underground drip irrigation field under the different treatment of soil moisture, Lathyrus latifolius plant height, crown, ramification and the main root of the regular observation and research analysis, the Yulin area in northern Shaanxi to seek a more water-saving irrigation methods, Lathyrus latifolius determine the appropriate underground drip irrigation, drip irrigation with the depth and spacing, for the local irrigation pasture to provide technical guidance, and expand in the region Grass planting area, thereby increasing their output to ensure that local sustainable development of animal husbandry. Initially the following conclusions:(1)Lathyrus latifolius appropriate irrigationIrrigation 270m3/hm2 Lathyrus latifolius growing peas best, followed by 180m3/hm2 irrigation and irrigation but 270m3/hm2 difference is not significant, irrigation 90m3/hm2 Lathyrus latifolius growing peas worst, irrigation and Lathyrus latifolius growth Are related, but the three irrigation, irrigation water use efficiency 270m3/hm2 lower, followed by irrigation of 180m3/hm2, irrigation90m3/hm2 higher. Variable factor for the irrigation of 0.8378, although the volume of water have multiplied, Lathyrus latifolius growth rate is not great. Irrigation 180 m3/hm2 more appropriate.(2) Lathyrus latifolius appropriate interval layDrip Irrigation pitch in with the laying of 100cm, with two drip irrigation can intersection of the moist, Lathyrus latifolius planting no matter what way can better meet the water demand requirements for drip irrigation with 60cm spacing although fully meet the requirements of the crop water requirements, but Drip irrigation with an increase of the number of projects increased investment. Drip with 140cm in the middle distance will not create moist areas, will form the fields of water supply shortage areas. Lathyrus latifolius growth and spacing negative correlation with drip irrigation, drip irrigation, with 60cm spacing better but Lathyrus latifolius growing distance between 100cm and the difference is not significant, the second pitch 100cm, 140cm spacing worst.(3) Lathyrus latifolius appropriate capillary depthSurface moist radius: depth of 10cm> depth of 25cm> depth of 40cm, Soil moisture evaporation rate: depth of 10cm> depth of 25cm> depth of 40cm, depth of 25cm and 40cm evaporation rate similar to that, drip with 10cm depth Drip irrigation most concentrated in the evaporation of surface water has also caused loss, the depth of 25cm surface area of less humid. In addition 10cm,25cm,40cm depth drip with the three levels, the depth of 25cm Lathyrus latifolius growing peas best, followed by the depth of 40cm, for the final depth of 10 cm.