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1989～1990年在河南新县开展了板栗施肥试验,以谋求其最佳施肥时间及经济施量。试材均选坡地上的板栗嫁接树,品种为二板栗。试验所用碳铵为本县化肥厂产,尿素为国产,四硼酸钠为美国进口。1989年板栗采收后,在卡房乡进行秋施追肥试验,株施碳铵1kg,次年近收获时分别对处理和对照树10株调查,前者较后者平均单位投影面积增加栗果0.171kg,增产幅度为44,07%,平均单株增产4.66kg。
From 1989 to 1990, a chestnut fertilizer experiment was carried out in Xinxian County, Henan Province, in order to seek the best fertilizing time and economical dosage. The test materials were selected chestnut grafted trees on the slope, the species is two chestnut. The ammonium bicarbonate used in the experiment was produced by this county fertilizer factory, while urea was made in China. Sodium tetraborate was imported from the United States. After chestnut harvesting in 1989, the Qiufang Township was subjected to the autumn top dressing test, with 1 kg of ammonium bicarbonate applied. Nearly 10 harvests of the control and treatment plants were surveyed in the following year. The former was 0.171 more than the latter in terms of projected unit area kg, yield increase was 44,07%, the average yield per plant 4.66kg.