瓜幼苗和黄色留下图片和预防的原因是什么

1.温度管理:从甜瓜幼苗中发掘出来的有高温要求。苗床的温度必须在25-30°C之间,以确保种子的光滑出现。2。水和肥料的管理:在出现瓜之前没有浇水。出现后,温度逐渐升高以及生长过程中的水量较大。这次,应及时补充水。3。光管理:在幼苗生长的早期,当温度适当时,应尽快揭幕晚期覆盖物。

1.图片和预防甜葫芦幼苗和黄叶

1.温度管理

(1)当瓜幼苗发掘时,温度要求很严格。苗床的温度必须约为25-30°C,以便种子可以平稳发芽。

(2)在出现之前,有必要防止由于低温和高湿度引起的突然疾病,因此必须在晚上采取冷保护措施。

(3)瓜生长第一个真正的叶子后,请务必做好蹲幼苗的好工作,以避免过度生长幼苗。

(4)当一天的温度在26-32的温度下保持26-32,当°C温度在12-16之间的温度太高时,温度可以增强通风。

2.水肥管理

(1)在出现瓜之前不需要浇水。出现后,如果温度逐渐升高,幼苗在生长过程中会蒸发大量水,因此您必须及时补充水,以避免干燥和干燥。

(2)可以在早晨的早晨选择浇水,并且在20-25°C下的水温不应太低,否则会影响根系的正常生长和发育。

(3)当发现幼苗缺乏肥料时,可以用浇水来喷洒1-2个低浓度的低浓度二氢磷酸盐溶液,以快速补充幼苗避免幼苗避免松散土壤之前1周的幼苗浇水。。

3.光管理

(1)在幼苗生长的早期阶段,如果温度合适,则必须提早显示以覆盖寒冷。

(2)在幼苗生长的中期注意通风。如果发现幼苗,应及时关闭通风的通风。幼苗恢复正常后,慢慢打开通风。

(3) In the case of high temperature and strong light, it can be covered at noon or cooling the water to cool down to avoid high temperature burning seedlings, resulting in excessive growth of seedlings.

4. Diseases and insect worship prevention
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(1) The diseases of melon seedlings mainly include vertical withering, withering, creammium disease, white powder, and disease.Generally speaking, these diseases are mainly caused by high temperature and high humidity environments, so we must pay attention to field permeability and drain water in time after rain to avoid inducing diseases.

(2) Pests mainly include aphids and red spiders.Avinin can be used to prevent and control diseases and insect pests.When preventing and controlling diseases and insect pests, you must pay attention to the concentration of the drug.The spray time can be selected at about 4 pm, and the sides of the leaves must be sprayed.

2. What are the reasons for melon seedlings and yellow leaves?

1. Absence

(1) During the growth process, the melon needs a variety of nutrients. The main reason for the yellow leaves of melon is nitrogen, phosphorus, potassium, calcium, iron, copper, and magnesium.

(2) Different symptoms of each kind of prime deficiency, nitrogen deficiency can cause leaves to become yellow and green, old leaves dry, new leaves are small and less; when phosphorus deficiency, the plant is short, the leaves are dark green, and there is no light., Gradually anxious, in severe cases, the entire blade will wither; the leaves become yellow when calcium deficiency, but the old leaves remain green; the leaves are pale yellow when the iron deficiency is green, but the veins are still green.Copper will cause green leaf green to gradually fade; magnesium deficiency can cause yellow leaf color, the most obvious leaf tip, but the veins are still green.

2.脂肪

(1)肥料和缺乏素食有些相似。如果您种植过多的肥料,则植物肥料会导致肥料,然后引起常见的黄叶原因。

(2)黄色的叶子通常在受精或喷雾后的1-2天内出现,该区域很大且常见。

(3)肥料引起的黄色叶子可以通过浇水或尿素叶表面肥料来缓解。

3.气候原因

(1)瓜的黄色叶子也与气候有关。大多数农民使用黑色膜覆盖技术来改善地面温度并加快瓜的生长。还可以防止散热,影响根系的生长,并导致过早衰老的黄叶。

(2)长期的雨天或菌株的关闭也可能导致叶子变黄,因此您必须注意耕种过程中的气候变化并进行正确的管理。

4.疾病
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(1)该疾病还会引起瓜的黄叶现象。它的代表性疾病是细菌叶枯萎病,它比叶片斑点更重要。这些疾病主要发生在高温和高湿度环境中,这些疾病易于扩散和扩散。

(2)叶子在发作过程中将出现黄褐色的斑点,并逐渐扩展融合。后来,叶子将出现大区域干斑,这会导致叶子无法正常光合作用。景瓷在线现货交易平台合法吗

(3)可以在发作的早期阶段喷洒和控制红细胞霉素,偶氮杀菌剂可以与Mackeio铜或细菌混合。

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