(A) The causes of crop leaf yellowing can lead to yellowing of crop leaves for various reasons. In general, the leaf yellowing caused by nutrient factors is a physiological disease caused by the lack of certain nutrients. One is the yellowing of leaves caused by nitrogen deficiency in plants. The first feature is the chlorosis of the old leaves in the lower part of the plant. For example, the nitrogen deficiency in maize turns yellow along the midrib of the leaf and extends from the tip of the leaf to the base of the leaf. When the trend is serious, the whole leaf is yellow, and the plants are short and the leaves are thin. The nitrogen deficiency of wheat shows that the wheat seedlings are short, the leaves are short and narrow, and the lower old leaves are yellow. If nitrogen can be topdressed in time, symptoms of nitrogen deficiency can be reduced. The other is the yellowing of leaves caused by iron deficiency in plants. Peach tree iron deficiency is characterized by yellowing of the upper new leaves, gradually yellow-white, while the old leaves remain green; peanuts are often symptoms of iron deficiency, the upper new leaf veins turn yellow and veins remain green. In the event of such symptoms, the application of 05% ferrous sulfate solution or liquid fertilizer should be promptly applied to reduce or eliminate the symptoms. (Source: Economic Daily, Rural Edition, 2005, Issue 28) (b) Crop Phosphorus deficiency Phytotoxicity Symptoms of crop phosphorus deficiency are not as pronounced as nitrogen. Symptoms generally start at the base of old leaves and gradually develop toward the upper part. Phosphorus-deficient plants have small leaves, dark green or gray-green leaves, and lack luster. Some plants such as soybeans, sweet potatoes and rape, etc. appear on the stems and leaves of purple spots or stripes, which is the performance of phosphorus deficiency. When the crop is deficient in phosphorus deficiency, the leaves are dead and fall off. Phosphorus deficiency can delay the tillering of cereal crops or not, and the leaves between the plants do not spread. The length is similar to "one stick of incense"; delayed heading, flowering and maturation, and the spikes and grains are less full. In addition, corn head baldness, rapeseed dislocation, cotton and fruit trees falling buds and falling flowers, sweet potato and potato tuber became smaller, and storage stability worsened.
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