稀土在初果期板栗树上应用效果为提高板栗产量和降低空蓬率，于１９９２—１９９４年在板栗初结果树上进行喷施稀土的试验，取得了明显效果。试验选在兴隆县兰旗营乡苇子峪村１０年生板栗园进行，为山坡地，土质为砾质壤土。喷施设４个不同浓度处理，即５００、８００、１... Effect of Rare Earths on Chestnut Trees in Initial Stage In order to increase the yield of chestnut and reduce the emptying rate, the experiment of spraying rare earth on the early chestnut tree was carried out in 1992-1994 and achieved remarkable results. The experiment was carried out in the 10-year-old chestnut garden of Wei Ziyu Village, Lanqiying Township, Xinglong County. It was a hillside and the soil was gravel loam. Spraying 4 different concentrations of treatment, namely 500,800,1 ...