论文部分内容阅读
水稻叶片含氮量在1.6—4.2%的范围内与光合速率呈显著的正相关。在3.4%左右或以上时,可保持高水平的光合速率,此可作为施氮肥的诊断参数。相应的叶绿素含量应在5.4毫克/分米~2左右或以上,试验表明:高光强条件下,叶片耗氮多,适当多施氮肥有利于提高光合速率。低光强条件下,多施氮肥并无好处。叶片中叶绿素含量的变化与光强度、土壤供氮能力、品种特性及光合速率的高低关系密切,可作为具体的诊断指标指导施肥。
There was a significant positive correlation between nitrogen content of rice leaves and photosynthetic rate in the range of 1.6-4.2%. At or above 3.4%, a high level of photosynthetic rate can be maintained, which can be used as a diagnostic parameter for nitrogen fertilization. The corresponding chlorophyll content should be about 5.4 mg / dm ~ 2 or above. The results showed that under the condition of high light intensity, the leaf nitrogen consumption was more than that of nitrogen application. Appropriate amount of nitrogen fertilizer was beneficial to increase photosynthetic rate. Under low light conditions, there is no benefit from applying more nitrogenous fertilizer. The change of chlorophyll content in leaves was closely related to light intensity, soil nitrogen supply, variety characteristics and photosynthetic rate, which could be used as a specific diagnostic indicator to guide fertilization.