| Based on photosynthesis,yield and harvest index,we studied the difference in the subsequent supply ability of soil nutrients after soil fertilized with different long-term fertilization models,so as to screen out the best fertilizer application pattern in lime concretion black soil area.Under no fertilization,the difference in flag leaf area and chlorophyll content between long-term mixed application of organic and chemical fertilizer MNPK and HMNPK was insignificant,but both of them were significantly higher than that of long-term application of single organic fertilizer M and chemical fertilizer NPK,the flag leaf area and chlorophyll content of M was slightly higher than that of NPK treatment.The flag leaf area and chlorophyll content of CK(no fertilizer application for a long time) was significant lower than that of other fertilization treatments.The photosynthetic rate,stomatal conductance,transpiration rate and chlorophyll fluorescence parameters Fm,ΦPSⅡ,Fv/Fm,ETR,qP of MNPK and HMNPK were better than those of M and NPK treatments,and the photosynthetic rate and each chlorophyll fluorescence parameters of M were better than those of NPK.Under no fertilization,compared to NPK,M increased grains per spike,economic yield and biological yield per pot by 10.0%,10.6% and 7.6%,respectively.The difference in economic yield and biological yield per pot between MNPK and HMNPK was insignificant,but they were higher than those of NPK and M.Compared to NPK,MNPK and HMNPK significantly increased economic yield and biological yield per pot by 26.3%,15.9%and 20.6%,14.0%,and spike number per pot,grains per spike,economic yield and biological yield per pot of CK were significantly lower than those of other treatments.The difference in harvest index between HMNPK and MNPK was insignificant,but they were significantly higher than that of long-term application of single organic and chemical fertilizer.Compared to NPK,M increased harvest index by 3.0%.The flag leaf area,chlorophyll content,photosynthetic rate and actual photochemical efficiency of wheat were significantly positively correlated to economic and biological yield per pot with a straight line.All the findings demonstrated that mixed application of organic and chemical fertilizer was better than single application of organic and chemical fertilizer in improving soil basic fertility and nutrient subsequent supply ability,and single application of organic was better than that of single application of chemical fertilizer.In addition increase of N application rate had no obvious effect on improving soil fertility under mixed application of organic and chemical fertilizer. |
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