Physiological Obstruction of Phosphorus Deficiency in Greenhouse Peach in Northern China and Preventive Countermeasures

With the adjustment of the industrial structure of agriculture, some greenhouses have been cultivated on the slopes of some shallow mountain areas of Shuangyashan City. Because the soil on the slopes of shallow mountain areas is mostly dark brown soil with gravel bottom, the absorption of zinc is low due to improper cultivation, and zinc deficiency occurs. phenomenon. In this regard, we conducted a systematic observation and correction work and received good results. We now introduce the main symptoms, causes of the disease, and orthopaedic techniques as follows.
1 Symptoms The leaves turn gloomy. From the base leaves, they develop into mosaics. The leaves become narrow, and the leaves are small and shrunken. The branches near the top of the branches are clustered by the internode shortening and appear as a rosette, falling from the bottom up. Branching shortening. New shoots can be re-emerged below the diseased shoots. The growth of the new shoots is normal at the early stage, but they are thin, deformed, and uneven in color in the later period, and shortened as the apex of growth grows. Small flower buds, small fruit, deformity, no food value.
2 Cause of disease The lighter part of the soil in the dark brown soil at the bottom of the gravel site makes the conditions of the peach tree poor. In addition, when the tree is planted, there is no targeted digging of deep diggings (holes) and backfilling of the black soil, which leads to the extension of the roots during the growth process. Not open, curly, absorption of micronutrient elements is poor, and ultimately zinc deficiency.
3 Orthotics
3.1 When planting trees, dig large and deep tree pits (holes) in a targeted manner. Backfill black soil and increase organic fertilizer. Special attention must be paid to the application of sufficient amounts of zinc fertilizer. Apply 100 g-150 g (g) of sulfuric acid to each tree. Zinc is mixed with backfilled black soil and added organic fertilizer and filled into tree pits (holes) to create a good site condition for the trees. Generally, the soil is applied with zinc fertilizer and the fertilizer has a long period of effect and can last for 3-5 years.
3.2 It is also possible to spray 0.1%-0.2% zinc sulphate solution or 300mg/L (mg/L) zinc naphthenate solution after 20 days (days).
3.3 Apply 0.5% zinc sulphate solution around 10cm (centimeters) of the lower part of the diseased branch, apply a circle to the ring, and apply 15cm-30cm (centimeters) to the ring-coated site. You will also receive satisfactory results. The efficacy can be maintained for 2-3 years.

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