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近年来,国内对一些农作物的叶龄规律作了深入研究,以叶龄规律为依据创造的叶龄指标促控法,在农业上广泛应用后,获得了显著的增产效益,而在林业上尚未见有这方面的报道。1984年,我们对泡桐属几个品种的当年埋根苗木主干叶龄规律进行了观察,并初步提出了泡桐当年埋根苗木叶龄指标和时间结合的促控管理法。一、试验地自然概况试验地设在许庄镇的黄家村三、七队和上吕村十一队,地处关中平原东部,海拔367.9米,属渭河二级阶地。年均气温13.4℃,≥10℃的活动积温4397.1℃,降雨量
In recent years, domestic laws on the leaf age of some crops have been studied in depth. Based on the rule of leaf age, the leaf age index control method was established. After extensive application in agriculture, significant yield-increasing benefits have been obtained, but not in forestry See this report. In 1984, we observed the law of the trunk leaf age of several species of Paulownia in the same year, and initially proposed the promotion and control method of combining the leaf age index and time of the buried tree seedlings. First, the experimental nature of the experimental site located in Xuzhuang Huang Village three or seven teams and on the Lv Cun 11 teams, located in eastern Guanzhong Plain, 367.9 meters above sea level, is a Weihe River two terraces. Average annual temperature of 13.4 ℃, ≥ 10 ℃ accumulated temperature of 4397.1 ℃, rainfall