【摘要】 苹果树施用适宜浓度的硝酸稀土可收到增产、优质的效果。施用方法应采用喷施,于盛花期、果实膨大期喷施两次。经济效益是投资与收益比为1:12.5。更多还原

【Abstract】 After receiving nitrate rare-earth in proper concentration9 the apple trees produced fruit of larger size and better quality.The nitrate rare-earth must be sprayed two times, one in full blossom, the other at fruit enlargemental stage, which offered high economic effects, the rate of investment and profit was 1: 12.5.更多还原