What are the causes of abnormal stems and leaves during the winter cucumber cucumber stage?

(1) Fertilizer damage: The leaves in the middle and upper part are neatly gilded and the tissues are not necrotic, the upper leaves become smaller, some of the leaf margins are parachute-like, and the growth points are tight. This phenomenon is due to excessive fertilization, resulting in excessive concentration of soil solution, rooting process can be seen root color rust, root tip blunt.

(2) phytotoxicity: The leaf margin is stained with greenish atrophy, and further becomes blueish and necrotic. This phenomenon is due to the large amount of spray, the number of sprays caused by the phytotoxicity. After the spraying was stopped, the lightly damaged leaves recovered and the new leaves grew normally.

(3) Ammonia damage: yellowing occurs between the edge of the middle leaves or veins, the veins are still green, and the boundary between the diseased part and the healthy part is clear. This phenomenon is a hazard of ammonia gas, and when the leaves are severe, they are dry.

(4) Dry and dead leaves of the heart: This phenomenon is caused by roots or fertilizers caused by excessively low soil moisture and excessive soil moisture. The leaves on one side were dry and the other side was normal. Most of the roots in the underground part were affected by fecal burning, insects, or mechanical damage.

(5) Manganese harm: The mesh-like bad spots appear on the leaves, and the bad spots gradually expand. The veins of the leaves turn pale yellow and die, and the hairs turn black. This phenomenon is caused by excessive fertilization, causing excessive manganese uptake in the root system, or excessive use of manganese-containing pesticides.

(6) The ground temperature is too high: In the morning, the edges of the leaves seem to be hot and hot, or polygonal or dot-like water stains appear on the leaves, and the sun returns to normal soon. This phenomenon is due to the fact that the ground temperature is higher than the air temperature. Under the condition of airtight and damp, the leaf transpiration is inhibited by the water in the leaf cells flowing into the cells.

(7) The temperature suddenly dropped: the middle and lower leaves were normal, and the upper leaflets rolled up on the edge, slightly wilting. This phenomenon is due to the lack of temperature management, premature ventilation during the day and a sudden drop in temperature. Severely affect the normal growth of leaves, leaves can not fully expand.

Nucleic Acid Extractor NFAST 32A

dna rna extraction,promega rna extraction kit,high pure viral nucleic acid kit,invitrogen rna extraction kit,viral rna mini kit

Shenzhen Uni-medica Technology Co.,Ltd , https://www.uni-medica.com