论文部分内容阅读
本文阐述了温州蜜柑叶片中氮、磷、钾的周年规律性变化;认为花芽形态分化期(一月)叶片营养组分与产量有直接相关;提出了丰产温州蜜柑一月份叶片氮、磷、钾的含量指标。 1、温州蜜柑春梢叶片的营养元素含量,氮素以花芽生理分化期(九月)为最高,幼果期(五月)次之,花芽形态分化期(一月)最低。当年开花结果多时,也有出现九月叶片含氮量低于五月,或五月叶片含氮量低于一月的情况。春梢叶片中含磷、钾量均以四、五月为最高,随着叶今的增加而逐渐降低,至翌年一月～三月为最低,在结果多时,也有出现九月叶片含磷、钾量低于一月的情况。 2、我们认为,温州蜜柑叶片分析的采叶时期以花芽形态分化期(一月)摘取去年春梢营养枝叶片为宜。此时营养组分对当年的产量有明显的正相关。而五月、九月叶片营养含量常因开花结果量多少而波动。 3、温州蜜柑的丰产营养指标,据我们的研究结果,初步认为,花芽形态分化期(一月)叶片含氮量应为2.7％(占干物质重)以上,至少不低于2.5％水平;叶片含磷量应为0.16％以上;叶片含钾量应为1.0～1.5％。氮、钾比率以1.91—2.80为宜。花芽生理分化期(九月)叶片营养含量与翌年产量尚看不出其相关性,但叶片含磷量高有提高翌年座果率的趋势。
In this paper, the annual variation of nitrogen, phosphorus and potassium in leaves of Satsuma mandarin was described. It was considered that there was a direct correlation between the nutrient components of leaves and the yield during the period of flower bud differentiation (January) The content of indicators. (1) The content of nutrient elements in the leaves of spring Satsuma mandarin leaves in Wenzhou was the highest in the period of physiological differentiation of flower buds (September), followed by the young fruit stage (May) and lowest in the flower bud differentiation stage (January). In those days when flowering was prolonged, there were also occasions when the nitrogen content of the leaves in September was lower than that in May or the nitrogen content of leaves in May was lower than that in January. Spring shoots leaves containing phosphorus and potassium were four in May as the highest, with the increase of the leaves and gradually reduced to the following January to March the lowest, when the result is long, there are also September leaf phosphorus, Potassium levels are lower than in January. 2. In our opinion, it is advisable to pick out the vegetative shoots of the spring shoots last year in the period of harvesting of the leaves of the Saturn (Citrus unshiu Marc.) In flower bud differentiation stage (January). Nutrient composition at this time had a significant positive correlation with the current year’s output. May and September leaf nutrient content often fluctuate due to the amount of flowering results. According to the results of our research, it is preliminarily believed that the leaf nitrogen content should be above 2.7% (dry matter weight) in flower bud morphological differentiation (January), at least not less than 2.5%. Leaf phosphorus content should be 0.16% or more; leaf potassium content should be 1.0 to 1.5%. Nitrogen, potassium ratio of 1.91-2.80 is appropriate. The nutrient content of leaves in physiological differentiation stage of flower buds (September) is not related to the yield of the following year. However, the high phosphorus content of leaves could improve the fruit yield of the following year.