The symptoms of nitrogen deficiency are thin plants, fine branches, yellow-green leaves and yellow leaves. When chlorosis begins, the leaves begin to grow from the old leaves and gradually expand upwards. Even the leaves of the new shoots fall off, the fruits fall, the fruit pieces are small, and the shoots grow longer. Stopped early. The prevention and control method is spraying urea at a concentration of 0.2-0.3% for 2 to 3 times, spraying once every 7-10 days, and the effect is quick. And connect water, soil urea.
In the absence of phosphorus, the growth of the plants was retarded, the leaves were small, and the leaves were dark green at first, gradually lost light and finally became bronze. When the phosphorus was severely deficient, the leaves were dark purple, and the old leaves showed symptoms first. The leaves become thicker and brittle, and early defoliation occurs. The yield is low and the character is poor. The prevention and control method is the spraying of the superphosphate leaching solution with a spraying concentration of 1% to 3%, spraying about 2 times, or spraying 0.2-0.3% of potassium dihydrogen phosphate solution outside the root, usually spraying twice, twice spraying. Interval 7-10 days, to make up for, with quick results. Connect and water the soil and apply diammonium phosphate to the soil.
In the absence of iron, young leaves at the upper tip of the new shoot first appeared yellowing and gradually turned white. The modification method is to spray the ferrous sulfate solution with a concentration of 1-3% on the leaves, continue the spraying 2-3 times, each time separated by 5-7 days, and a small amount of ferrous sulfate can also be applied to the soil to connect the water.
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