Effects of partially replacing chemical fertilizers by cow manure and corn straw compost on photosynthetic characteristics and yield of spring maize
In order to determine the appropriate proportion of cow manure and corn straw compost for replacing chemical fertilizers,Fumin 985 was used as the test material in this study,and five treatments were set up,including no fertilizer(CK),100%chemical fertilizers(CF),10%compost for replacing chemical fertilizers(CN),20%compost for replacing chemical fertilizers(CE),and 30%compost for replacing chemical fertilizers(CS).The changes of photosynthetic rate,key enzyme activities of carbon metab-olism at big trumpet stage,silking stage and filling stage,and yield and yield components of maize under different treatments were analyzed.The results showed that com-pared with CK,the cow manure and corn straw compost replacement treatment could significantly improve the photosynthesis ability and key enzyme activities of carbon metabolism of spring maize.Under the condition of applying compost,with the increase of the proportion of compost,the net photosyn-thetic rate(Pn),transpiration rate(Tr),stomatal conductance(Gs),intercellular carbon dioxide concentration(Ci)and key enzymes(phosphoenolpyruvate carboxylase,ribulose-1,5-bisphosphale carboxylase)activities of carbon metabolism of maize leaves in each growth period showed a trend of increasing first and then decreasing.Under CE treatment,the photo-synthetic parameters and key enzyme activities of carbon metabolism were the highest.The cow manure and corn straw com-post replacement treatment could significantly increase the yield,grain number per spike and 1 000-grain weight of spring maize.The grain yield of spring maize in CE treatment and CN treatment was 9.41%and 7.03%higher than that in CF treatment,respectively.This study can provide a good reference for the resource utilization of livestock and poultry manure and crop straw and the combination of the use and maintenance of cultivated land.
replacing chemical fertilizers by compostspring maizephotosynthetic characteristicsyield
万方数据
维普
