METHOD FOR DETERMINING THE LACK OF NITROGEN IN THE NUTRITION OF WINTER WHEAT PLANTS Russian patent published in 2022 - IPC A01C21/00 A01G7/00 

FIELD: agriculture, biochemistry and agrochemistry.

SUBSTANCE: invention relates to the field of agriculture, biochemistry and agrochemistry, namely to plant diagnostics for determining the lack of plant nutrition. The method includes determining the level of chlorophyll content in plants on the main sowing area in the field using a portable device. On the main sowing area, reference and control test plots are additionally created: on the reference test plots, an increased level of nitrogen nutrition of plants is created by applying a double dose of fertilizer relative to the hectare norm for this crop. On the control test plots, nitrogen fertilizers are not applied; on the main area of the surveyed crop, a single dose of nitrogen fertilizers is used, corresponding to the hectare norm of nitrogen. The increase in the level of chlorophyll content in plants is determined on the reference test plots and on the main sowing area. On the reference test plots, the increase in the level of chlorophyll in plants is calculated as the difference between the average level of chlorophyll in plants in the reference test plots and the average level of chlorophyll in the control test plots. On the main sowing area, the increase in the level of chlorophyll content in plants is calculated as the difference between the average level of chlorophyll content in plants on the main sowing area and the average level of chlorophyll content in the control test plots. The lack of nitrogen nutrition is judged by the coefficient of comparison of chlorophyll growth, which is calculated by the formula: Kc=Pre/Pro, where Pre is the average value of the increase in the level of chlorophyll in plants on the reference test plots, chlorophyllometer units; Pro - the average value of the increase in the level of chlorophyll in plants on the main area of the surveyed crop, units of chlorophyllometer. Wherein, if the value of the growth comparison coefficient is equal to or greater than 1.5, then a conclusion is made about a significant lack of nitrogen in plant nutrition, if the value of the growth comparison coefficient is less than 1.5, then a conclusion is made about a sufficient level of nitrogen nutrition for plants.

EFFECT: method provides an increase in the objectivity, accuracy and efficiency of determining the lack of nitrogen in the nutrition of winter wheat plants.

1 cl, 2 ex