Study On Drip Irrigation Under Plastic Film Of Soil Moisture Lower Limit In Different Rice Varieties

this article to be solved in direct sowing rice in Ningxia Yellow River irrigation area under film drip irrigation water saving, based on Yinchuan of Ningxia demonstration, drip irrigation area of Ningxia rice varieties with different soil water content and lower limits for a more experimental study on the system.The main research results are as follows:1.Through drip irrigation under plastic film Contrast Test in different soil moisture and lower limits of rice show:From the relative water content analysis of crop organizations have drip irrigation under plastic mulch paddy soils under water with a lower bound of theta water than other lower soil moisture; From chlorophyll analysis shows that drip irrigation under plastic film D10and jie3of rice soil moisture in the best lower bound is theta field, soil moisture with a lower bound of ningjing28the best0.8theta field; Obtained from the analysis of photosynthesis in Leaves of different soil moisture and lower limits on changes of net photosynthetic rate and transpiration rate of the same are increased first, then the downward trend, with lower soil moisture, net photosynthetic rate and transpiration rate with lower, lower soil moisture theta field photosynthetic rate substantially higher than the others; Lower soil moisture of rice varieties using spss for multiple comparisons (LSD) indicate that soil moisture lower bound of0.5Theta with0.8theta and theta yield significant difference between the fields of D10and jie3, lower soil moisture and Theta with0.8theta yield no significant difference between the fields,The lower limit of soil moisture0.5Theta,0.8thet, and theta significant difference exists between the yield of the fields of ningjing28. Integrated by the above analysis:Drip irrigation under plastic film in dry soil water content in the actual production of rice suitable for lower limits set for the theta field.2. Different varieties of rice that drip irrigation under plastic film show:Analysis of relative water content from the crop indicates that the most powerful water holding capacity is ningjing28,D10followed, the weakest jie3; Analysis of chlorophyll that ningjing28can be considered large bulk varieties of panicle idea; On Photosynthesis of analysis showed that the highest Net Photosynthetic Rate of ningjing28;By yield analysis showed that ningjing28of the lower yield is significantly higher than D10and jie3. Integrated by the above analysis:varieties of ningjing28for water conservation ideals.Experimental results show that the water lower bound theta field test of ningjing28is best programm.