(1) The middle and upper leaf margins are neatly gilded, the tissues are generally not necrotic and the upper leaves are suddenly smaller. Some of the leaves are “parachutes†and the growth points are tight. Most of the soil solution is excessive due to excessive fertilization. The resulting salt accumulation in the leaves.
(2) Ammonia Harm: Remove the visible roots of the root system has become rust, apex apex; leaf blade edge or veins between the leaves are still green, and then dry, clear boundary between disease and health is the performance of ammonia accumulation hazards. Before the melon seedlings were planted, chicken manure was not applied, and chicken manure excreted a large amount of ammonia gas in the confined greenhouse where the sheds were baited, and the guava seedlings were most susceptible to ammonia damage.
(3) The main root is rotted and the guaran seedlings show the core leaf rotten edge. Prevention: Pay attention to the application of decomposed chicken manure, do not apply too much fertilizer, and do not get too close to the root.
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