Effects of foliar spraying nutrient elements and plant growth regulators on mulberry
Clarify the effects of foliar spraying nutrient elements and plant growth regulators on fruit fall,appearance quality and physiological characteristics of mulberry fruit,and provide a reference for the practical application of nutrient elements and plant growth regulators on mulberry fruit.Beijiamei(T1),fluid Ca(T2),KH2 PO4(T3),secondary and micro-element fertilizers(T4),Youlixin(T5),2,4-D(T6),4-chlorophenoxyacetic acid(T7),NAA(T8),brassinolide+KH2 PO4+GA(T9)was carried out at the initial flowering stage,full flowering stage and final flowering stage,with water control.The number of falling fruit was investigated from 5 days to 32 days after treatment.Normal fruits were collected and their appearance quality(single fruit weight,longitudinal diameter,transverse diameter,fruit shape index,fruit hardness),endogenous hormones(IAA,GA,CTK,ABA)content,enzyme(SOD,POD,PPO,PAL,CAT)activity and mineral elements(total N,total P,total K,Ca,Mg)content were measured at 20 days after treatment.The results showed that the fruit drop rate of T7 treatment was 0 within the survey time range,and the fruit preservation effect was the best.Secondly,in the T5 treatment,the peak fruit drop rate occurred 9 days later than that of CK,and the cumulative fruit drop rate was 81.33%lower than that of CK.The peak fruit drop rate reached 11 days after T9 treatment,and the cumulative fruit drop rate was 49.21%higher than that of CK,and the fruit fell 17 days after treatment.Both T8 treatment and CK reached the peak fruit drop rate at 17 days after treatment.The other five treatments all had different degrees of fruit drop,and the peak time of fruit drop rate was later than that of CK.The appearance quality of the fruit under T6 treatment was lower than that of CK.T5 treatment had no significant effect on fruit appearance quality.The transverse diameter and hardness of T7 treatment were 17.12%and 83.92%larger than those of CK,respectively,and the difference was significant.The rest of the treatments tended to reduce the appearance quality of the fruit as a whole.T3,T4 and T8 treatments significantly increased the contents of four hormones,but the IAA/ABA and(IAA+GA+CTK)/ABA ratios in the fruits were lower than those of CK.T5 and T7 treatments significantly increased the contents of IAA and ABA in fruits,but decreased the ratio of GA/ABA,CTK/ABA and(IAA+GA+CTK)/ABA in fruits.T6 treatment significantly increased the contents of GA,CTK and ABA in fruits,but the IAA content was slightly lower than that of CK.T5 and T7 treatments significantly enhanced the activities of SOD,PPO and CAT in fruits.T6 treatment significantly reduced the activities of SOD,POD,PAL and CAT in fruits.T6 treatment significantly decreased the contents of total N,total K,Ca and Mg,and the other treatments significantly increased the Ca content of fruits,among which the Ca content of T5 and T7 treatments was higher,and the total N,total K and Mg contents were relatively middle,and the total P content was low.Therefore,foliar spraying of 0.25 mL/L Zn and 10 mg/L 4-chlorophenoxyacetic acid can effectively reduce the fruit drop rate of mulberry and stabilize or improve the appearance quality of fruit.
万方数据
维普
