Dynamics and demand characteristics of mineral nutrition in'Red Fuji'apple trees planted with dwarf rootstock and densely planted
In 2021,at Danfengshan apple planting base in Tangxian County,Baoding City,Hebei Province,the changes and accumulation laws of N,P,K,Ca,Mg,Fe,Mn,Cu,Zn and B elements in different organs of dwarf rootstock apple were dynamically monitored,and the nutrient demand characteristics of dwarf rootstock apple were analyzed.The results showed that during the whole growing season,the contents of nitrogen,phosphorus and potassium in leaves decreased in different degrees,while the contents of calcium and magnesium increased,among which magnesium fluctuated greatly but showed an overall increasing trend.The contents of iron,manganese,copper,zinc and boron in leaves,branches,stems and roots are all high in the early stage,while the contents of iron,copper and boron are low in the late stage,while the contents of manganese and zinc are low in the middle stage.The contents of nitrogen,phosphorus,iron,manganese,zinc and boron in fruits are all high in the early stage and low in the late stage,while the contents of copper and calcium are high in the middle stage,and the changes of magnesium are stable,while potassium is gradually increasing.The demand ratio of major elements N,P,K,Ca and Mg per unit yield is 1.00∶0.17∶1.88∶0.75∶0.25,and the demand ratio of trace elements Fe,Mn,Cu,Zn and B is 1.00∶0.66∶0.44∶0.20∶0.46.In order to produce 1,000 kg of fruit,the nutrient requirements of'Red Fuji'apple planted on short stock in full fruit stage are:nitrogen 1.32 kg,phosphorus 0.23 kg,potassium 2.48 kg,calcium 0.99 kg,magnesium 0.33 kg,iron 14.44 g,manganese 9.56 g,copper 6.40 g,zinc 2.82 g and boron 6.59 g.The results showed that the demand for nitrogen is high in the early stage of apple tree growth,the accumulation of phosphorus and potassium is gradually increasing,and the trace elements use the nutrients stored in the tree and consume less,while the demand for nitrogen is relatively reduced in the middle stage,while the demand for phosphorus,potassium and trace elements is enhanced;the basic application should be based on nitrogen fertilizer,followed by phosphorus and potassium fertilizer,supplemented with calcium and magnesium fertilizer in the middle and late stage,and supplemented with trace elements in due course.
apple'Red Fuji'dwarf rootstock densely plantedmineral nutritionlaw of changedemand
NETL
NSTL
万方数据
