For growers, knowing the crop's nitrogen needs can control the supply of nitrogen fertilizer in the right amount. In order to increase crop yields, crop diseases and environmental pollution that may be caused by excessive use of nitrogen fertilizers can be reduced. Some experiments have shown that the use of chlorophyll meter can help to reduce the amount of nitrogen fertilizer by 10% under the premise of ensuring that the crop yield does not decrease. The level of chlorophyll content has a great influence on the yield of crops. During the planting process, there is often a measurement using chlorophyll meter to understand crop yield. The level of soil moisture content in the process of planting has a certain influence on the chlorophyll content of the value, and it is precisely because of this drought and disaster relief will directly affect the final yield.
Soil moisture content was measured using a soil moisture temperature recorder at the walnut growth stage. The water content of the soil treated in the first stage (April 1 - June 20) was 95, 115, and 135, respectively. 155 g.kg-1 (38.5%, 46.6%, 54.7%, and 62.8% of the maximum water holding capacity in potted soils in turn); soil water content in the second phase (June 21-Oct. 31) water control They were 75, 95, 115, and 135 g kg-1 (the maximum water holding capacity in potted soil was 30.4%, 38.5%, 46.6%, and 54.7%, respectively). At the same time, the chlorophyll meter was used to measure the chlorophyll content.
During the plant growing season, the chlorophyll content of walnuts gradually increased as the growth process changed. Under the first phase of soil water control, the content of young chlorophyll in potted walnuts at different soil moisture content gradually increased from April 1 to June 20, especially from April 1 to May 1. After May 1, the increase was basically flat. In the same period, the content of chlorophyll in young walnut increased with the increase of soil water content, and the maximum increment was 0.05 mg·dm-2. In the first phase of the control soil water control and the second phase of different soil moisture content, in addition to 75g · kg-1 soil moisture content of young chlorophyll content decreased faster, the remaining three soil moisture levels of chlorophyll content The decrease was relatively slow, and the degree of reduction among the three levels was not significantly different.
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