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Knowledge Release: Cotton Stiff Seedling &Nbsp; Prevention And Cure Is Good.

2010/12/16 9:22:00 56

cotton

After pplanting, it was in the rainy season. Low temperature, rainy days and less light caused the cotton seedlings to turn green slowly, and the flower bud differentiation was postponed, resulting in the phenomenon of "stiff seedlings".

Stiff seedling

There are mainly types: first, seedlings with waterlogging.

Common in low-lying cotton fields, a long time of rain and waterlogging caused stiff seedlings, resulting in blackening of roots, greyish green leaves and slow growth.

The two is drought and stiff seedlings.

Mainly due to drought, leaves Huang Ganhong and new roots are few and grow very slowly, and the proportion of red stems is large.

The three is fat and stiff seedlings.

The main reason is that the base fertilizer is too shallow. The direct contact between fertilizer and cotton seedling root causes the root injury of concentrated fertilizer, which appears as dark and reddish leaves, often accompanied by physiological lesions, and the roots are thin.

The four is weak stiff seedlings.

The poor quality of the soil preparation, extensive planting, too deep planting or too shallow, and poor soil sealing resulted in this kind of stiff seedlings, resulting in small and weak seedlings and shrinking.

The five is plant diseases and insect pests.

The harm of Damping off, anthrax, Fusarium wilt, thrips, Aphis gossypii and other diseases often causes the cotton seedling leaves to be lacked or curled, the leaves are yellow and reddish, the roots are small, the internodes are tight, and the plants are short and stiff.

After the occurrence of stiff seedlings, we should carefully find out the causes and conduct symptomatic prevention and treatment.

For the stiff seedlings of waterlogging, drainage, cooling and root protection should be carried out. High standards should be set up for waist, gully and ditch to ensure fast rainstorms in 5 and June and lower the water table to below 60 cm, so that the rain can be dry.

And timely carry out wet cultivation, deep hoeing between rows, shallow hoeing between plants, for cotton seedlings early warming and oxygen supplement.

The most effective way is to prevent stiff seedlings caused by early damage.

watering

We can use interlacing water or point watering method to avoid flooding and restrain the recovery of ground temperature.

For fat and stiff seedlings, scientific fertilization should be applied to promote early onset.

The basic fertilizer should be reasonably matched and deep applied. The average amount of fertilizer applied to the farm is about 2500 kg, or the recovery of 40~50 kg in Hefei and 1.5 kg of boron fertilizer can prevent the shortage of vegetarian seedlings.

For all cotton fields with significant damage to seedlings, a shallow tillage should be carried out to catch the water on sunny days, and then zinc sulfate and ferrous sulphate such as 0.1%~0.4% should be sprayed.

For the weak stiff seedlings, the cotton fields before pplanting cotton seedlings should be finely arranged, and can be made into narrow boxes, deep trenches, fine soil layers, evenly distributed soil manure, and high and low solid specifications, so as to prevent hanging stiff seedlings and provide comfortable environment for early emergence of cotton seedlings.

After pplanting, cultivation should be carried out in time to promote root development, combine cultivation with soil, promote soil pformation and promote pformation.

Cultivation should be shallow and deep, and the roots should be low and then high, divided into stages, and generally 8~10 cm.

And combined with topdressing fertilizer, a small number of times, the general mu with urea 2~3 kg for water application, but also can be used for 6~8 thin thin man and livestock dung water.

Each top dressing should be carried out after cultivation.

For the rigid seedlings caused by diseases and insect pests, we should do the best on the basis of field investigation, do well in the prevention and cure work, and apply urea 3~5 kg to the mu, and then use the potassium dihydrogen phosphate solution of 0.2%~0.3% for 2~3 times to promote the early recovery of cotton seedlings.