When the greenhouse nectarines gradually change from the fruit enlargement period to the coloring period, in order to improve the coloration degree of the greenhouse nectarine fruit, the following points should be noted during the management of the coloring period:
The application of potassium fertilizer nectarine fruit into the coloring period has a higher demand for potash fertilizer. The timely application of potash fertilizer can effectively increase the yield and increase the sweetness of the fruit. In addition to foliar spraying of 0.3% of potassium dihydrogen phosphate, the application of potassium sulfate or potassium may be used more Sacred, grass ash and so on. General strain potassium sulfate 0.25 kilograms, or sprinkler 0.5 kilograms, or plant ash 2 to 4 kilograms, appropriate amount of water after fertilization.
Enhancement technology In order to achieve the purpose of coloring the greenhouse nectar, it is necessary to take measures to increase the light intensity in the greenhouse and improve the lighting conditions of the tree. Generally can be used wall hanging reflective screen, reflective film under the tree, cleaning the shed face. In the premise that the indoor temperature is not lower than the required temperature of the peach tree, the curtain should be uncovered as soon as possible, and the curtain should be covered later to promote the coloration of the fruit surface.
Temperature and Humidity Control Fruits entering the coloring period require daytime temperatures of 25°C to 28°C, no more than 30°C, nighttime temperatures of 15°C, and no less than 12°C. The air humidity is controlled below 60%, which is advantageous for coloring.
Thinning, hanging branches and sparse leaves can be carried out at the beginning of coloring. The method of sparseness is to first sparse the strong shoots on the upper part of the canopy and the periphery, followed by the dense shoots in the sparse canopy, so that the lower part of the canopy has a good spot. Hanging branches should be changed from red to red when the fruit on the Yang surface is about 10 to 15 days before harvesting. Hang the drooping fruit branches with a string. And remove the upper shading of the fruit leaves, so that direct sunlight on the fruit. However, it is too early to prevent the picking of leaves, so as not to affect the fruit development, increase cracking, and affect quality.
Withdraw the film for some middle and late nectarine varieties, when the temperature is high before harvest, open or remove the shed film, so that the peach fruit to receive 3 to 5 days of direct light, can significantly speed up the fruit coloring.
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