Effect of Mulched Drip Irrigation Frequency on Soil Water-salt Distributed and Rice Yield

In order to provide the basis for the distribution of soil water and salt mulch drip irrigation in rice under high frequency irrigation conditions,and to developed scientific irrigation system for drip irrigation rice,water and salt transport field experiments was conducted to study the impact of irrigation on the distribution of water and salt in paddy soil and on rice production.The results showed that:in irrigation quota of 12 000m3/hm2,irrigation frequency for 1d,less amount of irrigation water each time and water concentrated in the surface layers under 0-20cm.From jointing stage to the milky stage of rice,the highest moisture content was detected in different soil layers under films in 3d irrigation treatment,which maintained a higher moisture content in rice rhizospheric zone and prompted rice growth;Desalination effect was basically the same for 1dand 3ddrip irrigation in 0-40cm under film.Under high-frequency drip irrigation for rice field,more salt was leached above 40cm soil layers,and higher yield achieved.Under the fixed rice irrigation amount,irrigation frequency for 3d can maintain a relatively high moisture content in rice rhizospheric area of soil and keep better desalination in 0-40cm soil layers,which benefiting the growth and development of rice,and high yielding.