我们的研究是在1968—1972年于斯凯尔涅维采省果树栽培试验果园进行的。红花嫁( Rod Wealthy)苹果树于1965年秋栽植,这些苹果树是栽植在直径90厘米的水泥槽(或穴中),槽内填上河砂。槽底由一层透水的多孔的溶渣构成。 使用了六种施肥组合:春季在土壤中施用硝酸铵;春季喷洒尿素; Our research was carried out in the fruit-growing orchards of Skellnevica from 1968 to 1972. Rod Wealthy Apple trees were planted in the fall of 1965, and the apple trees were planted in 90-centimeter-diameter concrete troughs (or pits) filled with river sand. The bottom of the tank is made of a porous, permeable slag. Six fertilizer combinations were used: ammonium nitrate was applied to soil in spring; urea was sprayed in spring;