意大利果树工作者在生草制果园,用MM_(100)为砧的金冠、红玉和瑞光以及M_9为砧的Gra-Venstein苹果为试材,每公顷施用150或250公斤钾肥和60—240公斤氮肥作肥效试验。结果表明,较高的钾肥施用量并不能提高上述品种的产量;而氮肥则能不同程度地提高产量,尤以每公顷60公斤施用量 Italian fruit-tree workers used 150 or 250 kilograms of potash and 60-240 kilograms of hectare per hectare in grass orchards, with the golden crowns, red rubies and red light of MM_ (100) as well as Gra-Venstein apples with M_9 anvil. Nitrogen fertilization test. The results showed that the higher potassium application rate did not improve the yield of the above varieties; while the nitrogen fertilizer could increase the yield to different degrees, especially 60 kg per hectare