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Low rainfall, dry weather above 35 ℃ high temperature, we chose to use heat resistant Chinese little greens in 3 different insect nets to carry out the cultivation experiment in greenhouse, will now test results summarized below.

The experimental materials

Experimental material: heat-resistant chicken and vegetable.

This variety is a hybrid product of Chinese cabbage and Chinese cabbage, growing for about 20d, with a plant height of 15.5cm and a plant width of 13.4em.

Leaves ovoid, pale green, slightly wrinkled, petiole pale green, green appearance, suitable for high temperature production in summer.

Insect net color: 22 mesh silver gray insect net, overall coverage.

Net greenhouse is divided into three types:

Type A is the insect-proof net room of steel tube column type flat frame, with A height of 2.5m and an area of 1500m2;

Type B and type C are both 8m wide standard steel pipe greenhouses, with a length of 40m. The top film is clamped with a clip spring for continuous use. The greenhouses are clamped with a 22-mesh light-silver-gray insect-proof net at 0.4-1.6m of the skirt, and type B covers a shading net with a shading rate of 75%, and type C covers a shading net with a shading rate of 50%.

The experimental method

1. Before sowing, deep ploughing was applied with sufficient base fertilizer, and 667m2 was applied with commercial organic fertilizer of 1000kg and imported compound fertilizer of 30kg.

Type B and type C shall be constructed with 4 beds each, with A width of 1.7m and A height of 20cm, while type A shall be constructed with A width of 1.5m and A height of 20cm.

2. Mix seeds and fine soil well and then scatter the seeds, with a seed amount of 500g per 667m.

3. Cover with the floating surface of the sunshade net, open the indoor spraying and irrigation facilities of the net on the evening of sowing, pour enough water, and remove the sunshade net on the check surface after the whole seedling of chicken and cabbage.

The whole growth process is watered once a day in the morning to meet the water demand of chicken and cabbage without topdressing or pesticide spraying.it took 20 days.

Survey statistics

Indoor temperature, humidity and yield of chicken and vegetable.

(1) temperature and humidity survey: indoor temperature and humidity were investigated at 7 o 'clock, l3 o 'clock and 18 o 'clock on August 16, 30 and September 5, respectively.

(2) yield survey: weighing harvesting and converting to 667m yield.

Results and analysis

The temperature and humidity of different insect proof mesh room.

In sunny day, B type and C type two kinds of shelter tent room by using sun-shade net insect nets, insect nets indoor and outdoor temperature difference of 1 ℃ or so, at noon indoor also lower than outdoor temperature, cooling effect is obvious;

The indoor morning and evening temperature of type A insect control net is slightly higher than that of outdoor, and slightly lower than that of outdoor at noon, indicating that this type of insect control net room has A certain buffering process to rise and fall in temperature.

In cloudy and rainy days, the indoor temperature of the three kinds of insect protection nets was slightly higher than that of the outdoor in the three periods.

In terms of humidity, the indoor humidity of the three types of mesh room is higher than that of the outdoor room at noon and afternoon every day, indicating that surface water evaporation is very obvious in summer.