The Research On Moisture Movement Rule For Drip Irrigation With Plastic Mulch Of Corn

The research on soil moisture moving rule of drip irrigation under mulch is significant,it is useful for proper irrigation and higher yield.In this passage,we have studied the influence on soil moisture moving rule of row spacing and drip irrigation through simulation and field experiment.And discussed the situation of soil moisture moving in different rows and drip irrigation,it has discussed the row spacing of B1(40+80cm)?B2(50cm)?B3(60cm)and drip irrigation of I1(19.2L)?I2(24L)?I3(28.8L)respectively.We did the field test,tested the related parameter of field planting environment and confirmed the initial condition and boundary condition of simulation.,and got the soil moisture content curve of each row spacing and drip irrigation.It simulated the drip process of different row spacing and drip irrigation with FLUENT,and got the soil moisture distribution contours of different conditions,compared the results of field experiment and simulation,the simulation results are similar with field experiment results,it showed that:(1)In the same drip irrigation,the time for water to arrive the same depth of maize roots was different,the order was B3>B2>Bl;after it has irrigated about 12h,water could respectively arrived the depth of 45cm?38cm?30cm in B1?B2?B3;So the B1 row spacing can save irrigation time and enlarge the moisture scope than B2 and B3.As a result,the B1 row spacing have advantages than B2 and B3,so it is more reasonable.(2)In the same row spacing,the time for water to arrive the same depth of maize roots was different,the order was I1>I2>I3;when it was in the row spacing of Bl,the soil water moisture rose about 10%when the drip irrigation rose from I1 to I2;the soil water moisture rose about 5%when the drip irrigation rose from I2 to I3,but at this time,the soil water moisture was above field capacity.As a result,when the drip irrigation was in a higher level,increasing the drip irrigation was not good for the using of water efficiently.Combine the result of test and simulate,it showed that the B1 row spacing and I2 drip irrigation is benefit for the efficient use of water,and the soil water moisture is high in this condition.(3)In conclusion,the design of 40+80 row spacing(mulch in narrow row),24 L drip irrigation was reasonable for the drip irrigation with plastic mulch of corn.The planting pattern and drip irrigation system above can improve the efficiency of water application,and reach a better effect of drip irrigation.