In order to improve the quality of fruit under protected cultivation conditions, fruit quality issues must adopt special technical measures. Such as increasing lighting in the shed, adding CO2 gas fertilizer, spraying micro-fertilizer and increasing phosphorus, potassium fertilizer, etc., and open the crown, control branches prosperous, strengthen ground temperature control after the shed.

The problem of over-summer in solving the problem of over-summer fruit trees under protected cultivation conditions is mainly to ensure the protection of leaves, roots, trees, and strong branches. After the fruit is harvested, the shed film is opened and the sunlight is sufficient. The problems encountered are aging and renewal of old foliage, and accelerated growth of new shoots. In particular, when the rainy season arrives, sufficient water will often lead to leggy shoots and delay the defoliation, affecting the yield and benefit of fruit trees in the following year. The key to solving the problem of summer trees in fruit trees is to timely pruning. Peach trees need to remove the old branches that have already resulted, retain the unsuccessful shoots, and remove the erect branches, leggy branches, disease and insect branches, dead branches, and upper branches, and spray the growth inhibitors in time. The branches are prosperous to form full flower buds; the grapes must be picked up in time, wiped away, and the heart must not be overly heavy. The top should retain several secondary shoots to prevent winter buds from germinating. The second is to implement the pre-seedling system. Prepare the seedlings in carcasses or net bags (especially for some varieties of grapes), cultivate them in a nursery to form flower buds, move the resulting trees to the shed after falling leaves in autumn, and move the prepared seedlings. Go to the shed to carry out cultivation. In this way, cycling rickshaws can be planted in the same greenhouse for many years to maintain high productivity and efficiency.

Pollination problems Under protected cultivation conditions, high air humidity often causes pollen viscous and difficult to spread, and pollination is greatly limited. In order to ensure good pollination, the allocation ratio of pollination trees should be increased, and varieties with strong self-pollination ability and large amounts of pollen should be used. It is advisable to adopt artificially assisted pollination and combine other measures such as releasing bees and reducing the air humidity in the shed. `

Soil management issues should be carried out with shallow colonization and ridge cultivation. It is best to cover the mulch (previously to apply base fertilizer). This will not only preserve soil moisture, increase ground temperature, increase lighting in the shed, but also reduce ground water evaporation and reduce air humidity in the shed. The best conditions for drip irrigation.

The light intensity in the greenhouse within the shed is generally only 60%-70% of the natural conditions in the open field. Severely insufficient light will cause the growth of branches and leaves, and the photosynthesis intensity will decrease, which will affect the improvement of fruit quality. Therefore, we must pay attention to control shed height, generally control the shed ridge is not higher than 3 meters, the shed shoulder control in 1.2-1.5 meters; best reflective film on the ground, make full use of reflected light; choose a good light transmission film; limit the amount of branches , control the back branches prosperous. Temperature control in the greenhouse: The emphasis is on the regulation of the flowering temperature. This period is a crucial period for the success or failure of cultivation. It is generally required that the daytime temperature be controlled between 15°C and 20°C, and not less than 6°C during the night. The temperature requirements of other phonological periods are relatively less stringent, and the temperature can be controlled between 6°C and 28°C. The control of the temperature in the shed is mainly achieved by covering the grasshoppers or sheds at night, and opening the louvers for cooling during the day. Increase the ground temperature after the shed: After the shed, there is often the problem that the ground temperature and temperature cannot rise at the same time. Usually, the ground temperature is low. Low ground temperature often leads to slow growth, irregular growth, poor flowering after the first leaves, uneven flowering, and reduced fruit setting rate. To increase the ground temperature after the shed, cover the mulch under the trees 1-2 months before the shed. Covering the film too late has little effect on raising the temperature. Indoor air humidity control: Indoor air humidity is controlled at 55%-80%, which is beneficial to pollination and fruit development. Indoor air humidity control measures include ventilation and ventilation, covering the film, and controlling irrigation.

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