| According to the water shortage and alkali-saline soil in Yellow River irrigation area of Ningxia through the experiment with the goal of water saving and salt prevention,expore the effect on saline alkali land water and salt migration and the growth of oil sunflower in different irrigation methods and different agronomic measures.Illustrates the different irrigation methods and different agronomic measures of control the salt,salt and water movement rule.Put forward the salinization oil sunflower drip irrigation farmland precise irrigation technology;research the rules of the growth period of sunflower under the drip irrigation.Under the condition of drip irrigation daily water consumption intensity at sunflower different development stages.Stage water consumption and Total fertility cycle total water consumption and so on.Meanwhile,the technology applicable to alkali-saline soil and corps planting patterns are generalized,providing technical support for the modification of saline-alkali soil in Yellow River irrigation area of Ningxia.(1)In moderate salinization farmland.,follow the change of soil depth and time,the ridge surface of the soil moisture content is 2.55%higher than the ground surface,the maximum can reach 20.14%.The ridge small variations in soil moisture content,strong stability,good water retention,suitable for plant growth,ditch water easily.Therefore,ridging can make crops available more water.(2)In moderate salinization farmland total salt in soil changes with the change of time and space.The ridge in crops B soluble in all the reproductive cycle is always less than the ground E of drip irrigation,the difference is 19.28%,it shows the ridge irrigation control salt effect is better than flat drip irrigation.Decorate drip irrigation belt at the edge of the ridge can reduce crop root soil salt content.In the severe salinization farmland,the germination rate of the high ridge emergence rate was 100%higher than the ground.Therefor the ridge will help the emergence of crop growth.(3)Compared with the initial soil salt,the ridge drip salt content was reduced by 50%-70%,the ground drip irrigation was reduced by 20%-65%.After all the reproductive cycle of water-saving salt,the ground drip drip irrigation salinity was 31.16%higher than a high ridge.Comprehensive control effect of salt and moisture content,high ridge planting canopy drip irrigation for salinization farmland.(4)In moderate salinization farmland,the ridge with the ground plate of diameter of drip irrigation peacefully and hundred grain weight were very significant differences(p<0.01).The ridge and plain irrigation of leaf number show significant difference(p<0.05).When the ground to grow crops drip irrigation can promote the growth of oil sunflower,and plant height..The ridge,ensure the emergence rate at 60%,From the production and the emergence rate into consideration,the high ridge planting mode better.(5)Through the calculation of water consumption of oil sunflower,stage water consumption,the average daily water consumption,and we have been obtained in emergence-budding,from budding to flowering period of water requirement.These two periods can account for over 60%of the total fertility cycle.Through the water production efficiency high ridge can know drip irrigation water production efficiency highest,14.46%higher than the ground irrigation,50.8%higher than the ground irrigation.So from the water consumption and water production efficiency,irrigation water use efficiency,better crop yields for high ridge irrigation. |
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