The Effects Of Different Water Treatments On Yield,Quality And Water Use Efficiency Of Winter Oilseed Rape Under Film Mulching

As of 8 main crops, winter oilseed is the main crop that guarantee the safety of China’s edible oil. There are many research questions in the winter oilseed, for example, how to improve its production technology, growing period water consumption characteristics,the relationships between rape’s growth and water hot. To solve these problems, the paper hopes to research winter oilseed rape growth, water consumption process, and the impact on the final yield through film pot experiment."Shaanyou 7" provided by NWAFU were used for the study. Through the film pot experiment, analysisd the changes of physiological traits, yield, quality and water use efficiency of winter oilseed rape under the different water treatments. Five water treatments were designed in the test: soil moisture maintained among 70%~80% of field capacity in the whole growth stage(referred to as “qg”), soil moisture maintained among 60%~70% of field capacity in the whole growth stage(referred to as “qz”), soil moisture maintained among 50%~60% of field capacity in the whole growth stage(referred to as “qd”), soil moisture maintained among 60%~70% of field capacity in returning green stage(referred to as “fz”), soil moisture maintained among 50%~60%of field capacity in returning green stage(referred to as “fd”). The main conclusions are as follows:1. Winter oilseed rape’s growth conditions will be influenced by the water stress.Whether it is middle water treatment in returning green stage(fz) or low water treatment in returning green stage(fd), plant height and stem diameter will be lower than the high water treatment(qg). But the plant height and stem diameter growth rate of middle water treatment in returning green stage(fz) is higher than all other treatments in the stem elongating stage.2. The growth of winter oilseed rape in flowering stage will be substantially reduced. In the experiment, the plant height growth rate of winter oilseed rape in flower-ing stage only about 20% of the stem elongating stage.3. The chlorophyll content and photosynthetic rate of middle water treatment in returning green stage(fz) was significantly higher than all other treatments. The chlorophyll content and photosynthetic rate of low water treatment in returning green stage(fd) war lower than middle water treatment in returning green stage(fz), but still higher than all other treatments.4. The water stress in returning green stage can reduce water consumption of winter oilseed rape to some extent. In the experiment, the water consumption of fz treatment is reduced 4.06% when compared with qg, fd treatment is reduced 4.63% when compared with qg. Film also affect, the water consumption of qg treatment is reduce d 5.19% when compared with ck.5. The decline of oil content, protein content and oleic acid content caused by the water stress during returning green stage is not large, but the content of erucic acid, glucosinolate content of decline is much larger than the first three, and the erucic acid of middle water treatment in returning green stage(fz) is the lowest one.6. The middle water stress in returning green stage does not lead to significantly lower yield when compared with high water treatment(qg). In the experiment, the yield of fz treatment only reduced 0.15% when compared with qg, but its water use efficiency grew by 3.98% when compared with qg, and its grain weigh grew by 1.32% when compared with qg.To sum up, the minimal yield loss and maximum water utilization irrigation mode of winter oilseed rape is :maintain soil moisture among 60%~70% of field capacity in returning green stage,and the rest growth period maintain soil moisture among 70%~80% of field capacity.