The Study Of Different Irrigation Methods On Corn Growth And Root Zone Water, Salt, Nitrate Movement Law

Irrigation method suitable for the implementation of the measures of water saving irrigation in the whole growth period, there is obvious difference in different crop water consumption, the root characteristics and main root layer moisture; soil structure, permeability of different types are not the same, reasonable irrigation time and irrigation water strength can ensure the healthy growth of crops, for effective inhibition of enrichment of soil salinity can also play a positive role.The pot culture experiment with corn as the research object, study the direct irrigation, drip irrigation, micro-irrigation and other3irrigation methods under light salinized soil of maize growth and development and on soil moisture, electrical conductivity distribution, effect of nitrate nitrogen transport, to provide the fundamental basis to agricultural irrigation technology to select an appropriate mild saline-alkali soil and irrigation method.Test the tub forms, test barrel specifications:the barrel wall thickness2mm, diameter52cm, bottom diameter of37cm, height of56cm, the test soil dry naturally, and in accordance with the NaCl:Na2SO4=1:1configuration test soil quality, soil salinity is0.25%. A barrel of soil115kg, according to the preset weight (1.27g/cm3) uniformly stratified into1.5a barrel, according to kg mix in the activation of chicken manure to increase the base fertilizer, and no salt soil as the control. The test consists of10processing (see Table1), two repeat. Irrigation, drip irrigation, the micro run was3, direct irrigation and drip irrigation are respectively provided with2irrigation level; micro run with one irrigation level. Drip irrigation are respectively arranged4L/h, lOL/h two different flow dripper spacing is25cm, layout; micro run by a processing, micro run with a depth of15cm, the surge tank water supply, water head of2.0m, the whole growth period of continuous irrigation.This paper studies the direct irrigation, drip irrigation, micro-irrigation and other three kinds of profit under the same irrigation irrigation methods and different irrigation and irrigation intensity on mild saline soil and its effect on the growth of maize root zone soil moisture, salt and nitrate nitrogen transport effects, main conclusions are as follows:(1) Run seedling micro irrigation treatment plant height and stem diameter increased rapidly, the growth rate of the three largest irrigation mode, in which micro-run irrigation of corn processing plant height for watering a handle, drip la treatment, drip irrigation lb handle1.46times,1.25times,1.49times. Invalid because evaporation of surface water treatment greater water use efficiency is low. Drip irrigation on corn growth and emitter flow affects both.(2) After the jointing stage of the process under drip irrigation of corn growing in good condition, drip la treatment on plant height, leaf area growth is more favorable test results show that under drip irrigation amount equal treatment without salt salt processing than corn growing well. When the amount of irrigation water increased with growing corn is getting better. Because the micro irrigation Run pitch selection process is too large, so that the micro-Yun jointing day after infiltration sufficient to sustain crop growth needed to make micro-run irrigation treatment growth was inhibited after jointing.(3) Compared to the same three kinds of irrigation irrigation watering treatment under the larger surface evaporation, soil moisture infiltration is slow, mainly distributed in the soil surface moisture, lower soil moisture is low. The average moisture content of the soil root zone drip irrigation for watering1.43times, micro irrigation treatment for watering Run1.39times; trend from the conductivity can be drawn, slightly moist soil under irrigated conditions more favorable for corn growth, salt in the wet body edge aggregation. Micro-irrigation soil moisture lip long remained relatively stable state, nitrate content remained stable; drip irrigation and watering the soil moisture content before and after large changes in irrigation and nitrate content fluctuates with irrigation.(4) Drip2b (without salt) handling the largest relative water use efficiency, drip2b treatment followed. Run micro irrigation irrigation handle the smallest amount, but may be due to larger spacing test pipe, corn growth stage is obviously insufficient water supply, inhibiting the growth of corn late, resulting in the overall water use efficiency is not high.(5) From maize growth and root zone water, soil and environmental evaluation, drip irrigation and micro-Run for the growth and development of corn to create favorable conditions in which micro-Run to continuous water supply and irrigation water, salt, fat and obvious environmental stability excellent, if slightly moist micro-irrigation treatment can accurately grasp the Run with Japanese infiltration and crop daily water relations, set a reasonable amount of water pipe spacing and sunrise, on crop growth is a good water, increase irrigation techniques.Overall, drip irrigation and micro-Run can promote the growth of corn, with the increase in irrigation, drip processing corn growing well; micro-irrigation treatment reasonably calculate Run Run with Japanese micro-infiltration and corn on consumption water relations, on crop growth is a good saving, increase irrigation techniques.