| Soil salinization is one of the main factors hindering the agricultural production and oasis ecological environment construction in southern Xinjiang,the third division of Xinjiang production and construction corps red flag farm is located in the territory of KeZhou,the farm can use land resources 0.35×104·hm2,salinized land occupies more than 75%of the available land resources,salinization restricts the sustainable development of local agriculture and economic society.This study the soil salinization status of Hongqi farm in third division was investigated and dark tube row of salt effects on soil salt,nutrients and crop growth.To provide technical support for the control and repair of Hongqi farm salinization.Buried deep in different dark tubes,set 4 handles:1.2 m buried pipes(H12),1.5 m buried pipes(H15),and 1.8 m buried pipes(H18)and CK,the main results are as follows:1.Hongqi farms can be used to use land resources the total salt content of soil is high,large distribution area,there are differences in soil salinization degree in different land use types.The total salt content of farm soil is 10.44 g·kg-1,highest 79.90 g·kg-1,minimum 1.28 g·kg-1.The available land resources on the farm are 0.35×l04·hm2,According to the classification standard of soil salinization in Xinjiang,non-salinized soil 109.77 hm2 accounted for 3.11%;mild salinized soil 535.20 hm2 accounted for 15.15%;medium salinized soil 1454.00 hm2 accounted for 41.15%;severe salinized soil 742.33 hm2 accounted for 21.01%;salt soil 692.40 hm2 is 19.59%.The average content of soil total salt in different land use methods was respectively:Waste land 18.97 g·kg-1,abandoned cultivated land 15.96 g·kg-1,cotton land 8.74 g·kg-1,wheat 5.45 g·kg-1,grape 2.24 g·hg-1.2.Hongqi farms have low soil nutrients:Alkaline hydrolysis nitrogen content 10.65 mg·kg-1,according to the standard of soil nutrient grading in Xinjiang,it is extremely low;the mean content of organic matter was 5.47 g·kg-1,according to the standard of soil nutrient grading in Xinjiang,it is extremely low;The average content of soil quick-acting potassium was 121.82 mg·kg-1,according to the standard of soil nutrient grading in Xinjiang,the lower level,the average content of instant PHosPHorus is 17.98 mg·kg-1,according to the standard of soil nutrient grading in Xinjiang,medium level.3.It can effectively reduce the total salt content of soil,different buried dark tubes reduce the total salt of soil,1.5m buried deep dark tube is best,the closer the dark tube is to the salt,the better,the difference of total salt content in different depths of soil is not consistent.CK,the total salt content of soil was 18.33 g·kg-1 before the experiment,17.81 g·kg-1 after 1 years,a decrease by 2.85%,and 19.73 g·kg-1 after the 2 year,a decrease of-7.64%;1.2m,the total salt content of soil was 17.68 g·kg-1 before the experiment,12.69 g·kg-1 after 1 years,a decrease of 28.23%,and 10.68 g·kg-1 after 2 years,a decrease of 39.57%;1.5 m,The total salt content of soil was 15.94 g·kg-1,12.27 g·kg-1afterlyears,a decrease of 22.98%,and 8.61 g·kg-1 after 2 years,a decrease of 45.99%;1.8 m,the total salt content of soil was 13.64 g·kg-1 before the experiment,15.84 g·kg-1 after 1 years,a decrease of 13.85%and 11.79 g·kg-1,after 2 years,a decrease of 25.56%.Horizontal direction,1.2 m buried deep dark tube 0 m?6.25 m?12.5 m soil total salt content decrease in turn:39.57%?37.65%?37.33%;1.5 m buried deep dark tube 0 m?6.25 m?12.5 m soil total salt content decrease in turm:45.99%?43.71%?38.88%;1.8 m buried deep dark tube 0 m?6.25 m?12.5 m soil total salt content decrease in turn:25.56%?29.11%?24.95%?1.2m,the total salt content of soil in 0-120 cm soil layer decreased in turn:43.29%?48.78%?33.67%?28.28%?43.81%?37.33%;1.5m,the total salt content of soil in 0-150 cm soil layer decreased in turn:68.42%?58.62%?41.76%?36.97%?25.57%?46.87%?26.60%;1.8m,the total salt content of soil in 0-180 cm soil layer decreased in turn:42.28%?40.94%?28.32%?14.17%?32.81%?20.87%?5.36%?2.89%?4.The technique of dark tube salt drainage can reduce the soil speed potassium and the quick-effect Phosphorus,organic matter and total nitrogen have no obvious influence.CK,before the test,the content of potassium and instant Phosphorus was found:402.84 mg·kg-1 and 4.36 mg·kg-1,2 years later:402.86 mg·kg-1 and 4.34 mg·kg-1,1.2 m,before the test,the content of potassium and instant Phosphorus wasfound:348.72 mg·kg-1 and4.18 mg·kg-1,2 years later:295.50 mg·kg-1 and 2.81 mg·kg-1;1.5 m,before the test,the content of potassium and instant Phosphorus wasfound:380.36 mg·kg-1and 5.71 mg·kg-1,2years later:340.92 mg·kg-1 and 3.65 mg·kg-1;1.8 m,before the test,the content of potassium and instant PHosPHorus wasfound:427.83 mg·kg-1 and 5.06 mg·kg-1?2 years later:376.81 mg·kg-1 and 3.60 mg·kg-1.CK,the content of soil organic matter and total nitrogen was found before the experiment:4.47 g·kg-1 and 0.25 g·kg-1,2years later:4.45 g·kg-1 and 0.27 g·kg-1;1.2 m,the content of soil organic matter and total nitrogen was found before the experiment:5.04 g·kg-1 and 0.28 g·kg-1,2years later:4.53 g·kg-1 and 0.27 g·kg-1;1.5 m,the content of soil organic matter and total nitrogen was found before the experiment:5.51 g·kg-1and 0.31 g·kg-1,2years later:5.49 g·kg-1and 0.33 g·kg-1;1.8 m,the content of soil organic matter and total nitrogen was found before the experiment:4.92 g·kg-1 and 0.28 g·kg-1,2years later:5.14 g·kg-1and 0.31 g·kg-1.5.The salt technology of dark tube can reduce the groundwater depth and the drainage salinity.Groundwater depth decreased from 0.50-1.20 m to 1.68-2.50 m.The drainage salinity of dark tubes decreased from 28.42 g·L-1 to 13.71 g·L-1.6.The technique of dark tube salt drainage can improve crop seedling rate.The seedling rate of 1.5 m was the highest.Before experiment,test area is abandoned farmland,after the test test area the rate of crop emergence has arrived 42.72%.Among them 1.2 m?1.5 m?1.8 m the soil germination rate of buried pipes was in turn 41.25%?48.16%?38.75%?... |
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