水稻再生力与头季稻体内营养元素含量的相关性

Studies on the Correlativity of the Contents of Nutrients in the Main Rice and Their Ratooning Ability

以30个不同类型的水稻品种(组合)为材料,研究了其再生力与头季稻体内营养元素含量的相关性.结果表明:头季稻齐穗后18d体内营养元素含量与再生力的相关性较弱;头季稻收割时体内N和P含量与再生力呈显著正相关,K,Mg及Fe,Mn,Cu,B等元素含量与再生力呈显著或极显著负相关.因此,在头季稻收割前12d左右施1次促芽肥和头季稻收割后5d左右施1次保芽肥是必要的,P肥1次性作底肥施用,K肥可采用头季稻所需头季施,再生稻所需再生季施的方法;在头季稻生育后期应尽量避免施用Mg及Fe,Mn,Cu,B,Zn等微量元素肥料,以免影响水稻再生力.

A field experiment is conducted to examine the correlativity of the content of some nutrients in the main rice of 30 rice varieties (hybrid crosses) and their ratooning ability. The main results are as follows. The correlativity of the content of nutrients of the main rice at the 18th days after full heading and their ratooning ability are very slight. The correlativity of contents of nitregon and phosphor in the main rice at harvest and the ratooning ability is positive significantly, while that of content of the kalium, magnesium, manganses,copper and boron and the ratooning ability is all negative. Significantly or very significantly, respectively. It could be inferred from the above that the fertilization for promoting booting on the 12th day before harvest and the fertilization for protecting booting on the 5th day after harvest are both necessary. Fertilizer phosphor should be dressed as the basal fertilizer before transplanting, and Fertilizer kalium could be applied separately according to the nutrition characteristics of the main rice and ratooning rice, respectively. The micronutrient fertilizers such as magnesium, manganses, copper, boron and zinc should not be applied at the later growth stage of the main rice to avoid the influence on the ratooning ability.