Effects Of The Soil Moisture, Heat, Solut Dynamics Under Drip Irrigation Of Wheat In Northern Xinjiang

Drip irrigation technology is a kind of water saving technology that only partaial moistsoil and efficient use of irrigation water. It is widely used in cotton, vegetables and othereconomic crops, and the effects of water saving and increasing production is very significant.With the increase of demand for grain production, drip irrigation technology is applied indense planting crops (such as wheat), and the grain output is also improved in Xinjiang. Inthis paper, on the basis of research for the local irrigation wheat planting technology, using"xinchun6" as the varieties tested,"a tube of the five elements" model for planting, held onsoil hydrothermal salt dynamic test study on saline soils, the results are obtained as follow.(1) Reasonable irrigation water to the improvement of soil water distribution uniformity.W3in time and space distribution of soil moisture difference is small, one day after irrigationsoil moisture uniformity coefficient is93.82%, and than W1,W2,W4higher6.2%,5.0%,1.3%; change over time W3than W1, W4, lower14.74%,6.98%. The increase of irrigationquota can make the whole space of soil moisture content of the soil increased, and W4thanW1, W2, W3more9.6%,7.1%,9.6%.(2) Soil profile has obvious low salt area after water, profile of salt distribution existobvious front, with the increase of the irrigation quota of salt back down, away from the dripcapillary diffusion. The upper soil salt content is relatively lower, relatively higher salinityfront at one day after irrigation;with the time delay, at3days after irrigation soil salt frontupward migration, near drip capillary contraction, at6days after irrigation in the soil profilesalt frontal is not obvious,and remote distance drip capillary (15to30cm) salt content ishigher, Salt accumulation obviously again.（3）0-40cm deep soil moisture and salt changes over time range is larger during wholestages, and less influenced by irrigation quota;40-80cm soil layer soil water and salt becomesmaller, and greatly influenced by irrigation quota;80-100cm soil layer soil water and saltbecome smaller, and less influenced by irrigation quota. Soil salt content showed a trend ofrise of change after the first drop. In the harvest the upper desalination and the lower saltdeposition near the capillary location, salt deposition distal the capillary location. After thewater the upper desalination and the lower salt deposition, and desalination is more obviouscloser the drip capillary, and irrigation quota desalination rate increases, salt deposition rate isreduced, desalting depth increases. The average depth of desalination is47cm(W1),40cm(W2),43cm(W3), and50cm(W4).(4) The correlative relationship between desalting rate and irrigation quota show, fromthe capillary0cm,0-40cm soil desalting rate is influenced by irrigation quota is lesser,desalination rate increase is not obvious with the increase of the irrigation quota; from the capillary30cm,0-40cm soil desalting rate is strongly influenced by irrigation quota, withthe increase of the irrigation quota desalination become obvious; at>40-80cm and>80-100cm depth, desalination rate increases and reducing salt deposition rate with the increase of theirrigation quota.(5)Throughout the wheat growing season soil temperature linearly increase withincreasing the air temperature rising; during20days to50days after emergence, soiltemperature change trend present a low, after the soil temperature rise by linear trend. Soiltemperature rise become relatively flat, and significantly reduce the upper soil temperaturewith the increase of the irrigation quota. Irrigation quota on the depth of5cm and10cm soiltemperature effect is significantly higher than15cm or20cm.(6) The drip irrigation quota has remarkable effect on wheat growth and yield, increaseirrigation quota contributes to growth index and photosynthetic physiological indexes of dripwheat, but too much water makes the plant leaf area, biomass accumulation, photosyntheticrate, stomatal conductance decreased, have an unfavorable influence on the growth of wheatgrowth. Through regression analysis found that the plant height, transpiration rate andirrigation norm significantly correlated, the rest of the physiological indexes related to degreeof weaker growth. Eventually lead to the W3yield the highest, followed by W4, W2, W1, themain cause of forming yield difference is thousand seed weight. Water production efficiencyof W3is significantly higher than other irrigation quota, and no obvious difference betweenother processing.(7) The wheat and the drip capillary distance to significantly affect the growth，the wheatwas more poor at long distance. Increased irrigation quota to alleviate inter-row growth indexdifference, obviously conducive to travel the growth of wheat plant height.