磷酸二铵配施不同增效剂对玉米生长及养分吸收的影响OA

To screen synergistic 57%diammonium phosphate(DAP)that can promote maize growth and improve nutrient uptake,conventional 64%DAP was used as the control(CK),and four 57%DAP treatments amended with different synergists were set up,including biochemical fulvic acid(T1),polyglutamic acid(T2),nitro-fulvic acid(T3),and chitosan oligosaccharide(T4).Agronomic traits,biomass,and nutrient contents of maize at different growth stages under various treatments were compared and analyzed,and principal component analysis was adopted for comprehensive evaluation.The results showed that compared with CK,under T3 treatment,the leaf SPAD value and plant height at the jointing stage increased by 15.17%and 17.30%,respectively;the stem diameter and maximum leaf length at the large bell stage increased by 35.10%and 31.62%;the maximum leaf length at the tasseling stage increased by 18.82%.Meanwhile,the aboveground dry weight increased by 22.87%,and the aboveground nitrogen and phosphorus nutrient contents increased by 27.78%and 33.33%,respectively.These results indicate that T3 treatment could significantly promote maize vegetative growth,expand photosynthetic leaf area,and enhance dry matter accumulation as well as nitrogen and phosphorus uptake capacity.Moreover,T3 achieved the highest comprehensive score,which was significantly superior to other treatments.Comprehensive analysis demonstrated that T3 treatment(57%DAP supplemented with nitro-fulvic acid)could facilitate maize development by improving root growth and nutrient absorption.Therefore,it can be popularized and applied as the optimal synergistic 57%DAP to realize chemical fertilizer reduction and efficiency improvement in maize cultivation.