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为研究栗树叶片氮素含量与施氮量及坚果产量等因素间的关系,于1987~1989年在风城县开展了辽丹68号多点试验。结果分析表明,叶氮含量为2.17~2.30%时,施氮能提高叶氮含量,与产量增长呈极显著的正相关,与单株有效枝量及新梢生长量呈显著的正相关。试验认为,叶氮含量2.3%这一营养水平,可作为评定丰产栗树(园)氮素营养状况的参考指标。据此提出,在辽宁东部栗产区,高接5~8年生、冠影面积9~16m~2、株产5~10kg的栗树,施氮量为276~414g/株·年,氮、磷、钾比例2:1:1为宜。
In order to study the relationship between the nitrogen content of chestnut leaves and the amount of nitrogen application and the yield of nuts, a multi-point trial of Lidan 68 was carried out in Fengcheng County from 1987 to 1989. The results showed that nitrogen application increased leaf nitrogen content significantly when leaf nitrogen content was 2.17 ~ 2.30%, and had a significant positive correlation with yield growth, and had significant positive correlation with effective branch yield and shoot growth. According to the test, the nutrition level of 2.3% leaf nitrogen content can be used as a reference index to evaluate the nitrogen nutrition status of high yield chestnut tree (orchard). It is suggested that in the chestnut producing area in eastern Liaoning, the chestnut trees with 5 ~ 8 years old, 9 ~ 16m ~ 2 crowns and 5 ~ 10kg crown plants have nitrogen application rates of 276 ~ 414g / Phosphorus, potassium ratio of 2: 1: 1 is appropriate.