Impact of Straw Returning Combined with Fertilizer Application on Soil Nutrients and Agronomic Traits and Yield of Highland Barley
The study aimed to investigate the effects of combining rapeseed straw returning and chemical fertilizer application on soil nutrient composition,agronomic traits and yield of highland barley in Tibet,to provide a scientific basis for the efficient utilization of rapeseed straw resources as fertilizer in this region.Field experiments were conducted using the cultivar'Zangqing 3000'.Four levels of fertilization were applied(urea and diammonium phosphate at rates of 0,60,120 and 180 kg/hm2,and 0,75,150 and 225 kg/hm2,respectively),alongside four levels of rapeseed straw returning(0,1500,3000 and 6000 kg/hm2).The results showed that rapeseed straw returning predominantly influenced the total phosphorus and organic matter content in the topsoil,while the fertilization primarily affected total nitrogen and phosphorus content,with no significant effect on other soil nutrients.In terms of agronomic traits such as basic seedling number,plant height,effective panicle number and yield of highland barley,there were significant differences between different fertilization levels.At the same time,there were also significant differences in basic seedling number and yield between different straw retuning treatments.The integration of straw returning and chemical fertilizer application was found to enhance barley yield compared to the exclusive use of chemical fertilizers.The maximum barley yield was achieved with a straw returning of 6000 kg/hm2(full returning)and application of urea and diammonium phosphate at 180 and 225 kg/hm2,respectively,resulting in a 4.03％ yield increase compared to the yield without straw returning at equivalent fertilization levels.In conclusion,in Tibet,rapeseed straw returning combined with chemical fertilizer application can not only enhances soil nutrient,but also significantly increase the yield of highland barley.
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