论文部分内容阅读
前言以前认为果树的花芽分化是受制于树休内碳水化合物和氮素之间量比关系的影响。这个学说称作碳——氮学说,是果树栽培的基础概念,但后来为了证实这个学说而从事的研究反而得到了许多否定的见解。此外,在研究日本梨品种间的花芽形成的难易和碳/氮比率关系时,发现花芽形成不良的新水碳/氮率比花芽形成良好的丰水高。为了弄清花芽形成与氮素营养间的关系,本研究用三个日本梨品种(新水、丰水和二十世纪)为试材,探讨了氮肥施用浓度和施用时期的影响。
INTRODUCTION It was previously thought that the flower bud differentiation of fruit trees is influenced by the relationship between the amount of carbohydrates and nitrogen in the tree. This doctrine, known as the carbon-nitrogen theory, is the basic concept of fruit tree cultivation, but much later, the research carried out in support of this doctrine has received many negative opinions. In addition, when studying the difficulty of flower bud formation and the ratio of carbon / nitrogen among Japanese pear varieties, it was found that the fresh water carbon / nitrogen ratio of poor flower bud formation was higher than that of good flower bud formation. In order to understand the relationship between flower bud formation and nitrogen nutrition, three Japanese pear cultivars (Aishu, Fushui and Twentieth Century) were used as experimental materials to study the effects of nitrogen application concentration and application period.