Nitrogen deficiency and excess of onion

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Insufficient nitrogen, growth is inhibited, yellowing begins from the outer leaves first, and will die when severe; however, the root system still maintains life. In the early stages of the formation of the plant's vegetative body (leaves and bulbs), the requirement for nitrogen is high, and this is also the critical period for the need for nitrogen. After entering the bulb formation period, if the supply of nitrogen is insufficient, the bulbs will be poorly grown and grow, the appearance will be elongated, and even the growth period of the mast will be curbed, and the inherent high yield capacity cannot be fully utilized.
On the contrary, if nitrogen is absorbed excessively, the leaf color is dark green, the developmental process is slow, and the leaves are greedy and green to delay ripening, and they are easily infected. In general, soil nitrogen is easily physiologically disturbed at 30 to 60 milliequivalents. Because when nitrogen is supplied too much, due to excessive accumulation of water-soluble nitrogen inside the scale, calcium deficiency is exhibited, and heart rot (calcium and rot inside scales) and muscle rot (outer scale rot) are prone to occur.

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