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日本千叶县暖地园艺试验场以“宫川早生”为试材,于1967年定植。采用4种栽培条件:1,深耕(0.6米)施肥(标准量)加修剪疏果,2.深耕施肥加不修剪不疏果,3.不深耕少施肥(1/2标准量)加修剪疏果;4.不深耕少施肥加不修剪不疏果。同时各有4种栽植密度:1250、2500、5000和10000株/公顷。根据对4～19年生(1969～1984)树的测定数据,探讨了栽植密度及栽培条件对叶面积指数(LAI)的影响,分析了不同树龄获得最高产量时的LAI,以及LAI与产量间的关系。结果表明;①LAI随着时间的推移而变化,深耕施肥比不深耕少肥的LAI较高,不修剪不疏果比修剪疏果的LAI较高。②在不同栽植密度条件下,LAI均随树龄的
Japan Chiba warm-horticultural test field “Miyagawa early” as a test material, colonized in 1967. Using four kinds of cultivation conditions: 1, deep plowing (0.6 m) fertilization (standard amount) plus pruning thinning fruit, 2 deep fertilization plus pruning not thinning fruit, 3 not deep plowing and less fertilization (1/2 standard amount) Fruit; 4. Not deep plowing less fertilization plus not pruning fruitless fruit. At the same time each has 4 planting density: 1250, 2500, 5000 and 10000 plants / hectare. The effects of planting density and cultivation conditions on leaf area index (LAI) were studied based on the data of 4-19 year old (1969-1984) trees. The LAI at the highest yield of different tree ages and the relationship between LAI and yield relationship. The results showed that: (1) LAI changed with the passage of time, and the LAI with deep plowing and no fertilizing was higher than without deep plowing. The LAI with no pruning and non-pruning was higher than that with pruning and thinning. ② Under different planting densities, LAIs were all along with age