| Moistube irrigation is a little infuse water, driving force for pipe wall inside and outside differential pressure, according to the crop water requirement, realize the dynamic balance of soil moisture, simple structure, low operating cost, improving the soil moisture environment, decrease the surface evaporation, etc. In order to providing basis for the scientific design and application of the moistube irrigation technology, this study exploring moistube hydraulic performance and practical application field throught two parts tests.1) Moistube irrigation is a kind of continuous irrigation technique, through the ground belt way, using the flim water potential diversity as a driving force, priming mover water slowly to the crop root zone. Therefore, in order to best comprehend the main factors effecting on the flow of the moistube and to determine the relationship between the flow and press, in the case of the different soil initial mass moisture contentand soil bulk density, the completely random experiment design in field of arable land was used to test the influence of different pressure on moistube flow; 2) In order to explore the influence of moistube irrigation for crop growing and harvest, using the summer corn of Zhengdan 958 and the winter wheat of Xiaoyan 22 as the study objects. Compared with subsurface drip irrigation and no irrigation to study moistube irrigation have an effects on crop growing, harvest, water use efficiency(WUE) and soil electrical conductivity(Ec) of summercorn and winter wheat. The main test of conclusions are follows:(1) Pressure was the most crucial factors affecting the moistube flow, then the soil bulk weight, and soil initial moisture content at least. When soil initial moisture content and bulk density was increased, moistube flow keeped a downward trend. Moistube flow was mainly controlled by pressure, there was a liner relationship between pressure and flow within a certain range(the water head varies from 0 to 2.1 m), the decision coefficient R2>0.85. Moistube flow coefficient(k) and flow(b) with zero pressure were not simply determined by the Moistube’s characteristics. The Pearson correlation coefficient of oil initial mass moisture content and k showed a significant inverse correlation respectively(P < 0.05), and the Pearson correlation of coefficiention of bulk density and b showed a significant negative correlation respectively(P< 0.05). The moistube flow coefficient(k) and flow(b) being decided throught soil initial moisture content and soil bulk weight.The moistube flow coefficient(k) and flow(b) with zero pressure would be decreased when of the soil initial moisture volume and soil bulk weight were increased.(2) The moistube had a weak and short duration self-regulation function of flow with the change of soil moisture volume. The irrigation time increased, the moistube flow increased quickly and then decreased to steady state.(3) Compared with subsurface drip irrigation, moistube irrigation treatment’s stem length, dry and fresh weight, population growth rate and yield components on the basis of different crop types are differents, stem length, dry and fresh weight and growth rate difference is small.Summer maize’s ear diameter and spike have a significant decrease(P<0.05),while winter wheat’s characteristics of ear have no significant(P>0.05). Compared with no irrigation, plant height, weight of dry and fresh, population growth rate and yield components have a significant increase. With moistube arrangement spacing decreases, the summer maize and winter wheat’s stem length, dry and fresh weight and growth rate, characteristics of ear showed a trend of increase.(4) Moistube irrigation(continuous irrigation) is significantly lesser than subsurface drip irrigation(intermittent irrigation)(P<0.05), but production is significantly higher than that without irrigation(rained) treatment(P<0.05), the moistube irrigation water consumption are much smaller than the subsurface drip irrigation, about 1/4 to 1/2, moistube irrigation is one of the effective irrigation way to crop yield. Moistube arrangement spacing has a great influence on crop yield, With moistube spacing decreases, crop’s yield is increased, irrigation water use efficiency were showing decrease, Based on the irrigation water use efficiency, moistube spacing 60 cm is reasonable for moistube arrangement in the Shaanxi province of Guanzhong region.(5) The spacing of moistube have less effect on the soil electrical conductivity, different moistube arrangement spacing of the change trends of soil electrical conductivity, In moistube irrigation with the subsurface drip irrigation(intermittent irrigation), no irrigation are the same ways in distribution of soil available nutrients and supplies, the leaching amount was small, the soil available nutrients was supply stability and conducived to crop uptake, in the 0~80 cm layer of soil. Moistube irrigation has the feasibility of the application of intensive crops in the field. There was a significant correlation on crop yield with soil electrical conductivity while grouting mature at the 10~20 cm soil depth electrical conductivity of 10~80 cm soil depth(P<0.05), Excepting the saline area. It is feasible to estimate the yield of summer maize and winter wheat, using 10~20 cm soil layer electrical conductivity or the average10~80 cm soil layer electrical conductivity. |
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