| The saline-alkali land of Shanxi Datong basin,which is the important reserved land resources,is the key point to solve the shorten land resources and grain issue of our provinces.There are about 300 ten thousand acres saline-alkali land resources,which one of the most important reason to slow the development of local economy and to block the farmer' income is the shortage of the water resource and the soil salinization.The lower price of drip irrigation facilities and the lack of water resources make the drip irrigation progress which one of the most rapid water saving irrigation measures,that make the greenhouse pot facilities agriculture to field crops and the research of improving saline alkali soil planting environment.This experiment was planted the alfalfa and sweet clover in the high saline-alkali in the place of Shanxi Datong basin shanyin county houzhangbu village.It was irrigated by different pan coefficient(Kcp=0.1,0.3 and 0.5)to study cultivation patterns of flat planting and ridged planting on the soil alfalfa and sweet clover,which the features of water and salt transport in soil and seedling rates of alfalfa,plant heights,fields and water efficiently in different conditions of alfalfa and sweet clover;studying the Mathematical relationship of the saturated soil paste and soil solution under 1:1 and 1:5 soil/water ratio.The experiment found those conclusions:1)There were electrical conductivity significant correlations between the saturated soil paste and soil solution under 1:1 and 1:5 soil/water in the datong basin,we could use a linear function model ECe = 8.2457EC1:5-0.2669,R2=0.9461 and ECe = 2.1937EC1::-0.0023,R2 = 9639 to calculate it;2)A pH Second Linear Fitting Relationship between the saturated soil paste and soil solution under 1:1 soil/water was pHe =0.7489 pH1:52-12.919pH1:5+ 63.646,R2 ?0.8712;a pH Second Linear Fitting Relationship between the saturated soil paste and soil solution under 1:5 soil/water was pHe=0.4464pH1:12-7.32pH 1::+37.965,R2 =0.9076;The negative logarithm method of hydrogen ion was adopted and the formula is replaced,the pH between the saturated soil paste and soil solution under 1:1 soil/water is pHe =1g(0.2448×10pH1:1+107),R2=0.9621;the pH between the saturated soil paste and soil solution under 1:1 soil/water is pHe = 1g(0.2353 ×10pH15-108),R2 = 0.8559;3)If we want to calculate the EC and pH,we should adopt the saturated soil paste,but the saturated soil paste is difficult to preparation,so we could choose soil solution under 1:1 soil/water;4)By the contrast of cultivation patterns of flat planting and ridged planting,we found the cultivation patterns of ridged planting was superior of flat planting when salt leaching,while the yield gap was not obvious.So it was arecommended that in the severe saline land area can take ridged planting way,the ridged planting mode for irrigation could be better than flat planting mode of salt-leaching in the seedling stage,the salt tolerance of crops in seedling stage was the weakest,which could increase the germination rate;5)The amount of water in different drip irrigation for salt-leaching results showed that at the range of soil moisture,evaluate the effects of pan coefficient(K cp=0.5)of 3 days cultivation patterns of ridged planting's EC and pH was fallen more obviously than other conditions,the sweet clover and alfalfa production was the highest than others,the condition of water use efficiency(WUE)ridged planting of 30%was the highest utilization efficiency.The flat planting mode conditions of pan coefficient(K cp=0.5)of 3 days was the highest efficiently;So if you pay attention to the effect of salt-leaching and forage production,we can use 50%E irrigation,if we pay attention to the efficiency of water use,we could use 30%E irrigation;6)In this two kinds of forage grass,under the condition of same irrigation quantity,sweet clover of plant height and yield significantly higher than the alfalfa of plant height and yield. |
PDF Full Text Request