In the past few days, the author has been guiding growers in vegetable sheds in nearby villages and found some problems. Mainly in the management technology, growers either stick to the rules, or blindly follow the flow to see what others do. As the so-called law of indefinite law, growers really need to solve is in accordance with the actual situation of their own greenhouses, and take appropriate management measures. Take the cultivation of tomatoes for example, what the book says, experts say nothing wrong, can be described as universal. However, if you copy it, there are plenty of losers.

Take the cover film as an example. Under normal circumstances that the cover film can increase the ground temperature, reduce air humidity, but in Zhangcun had appeared to cover the film but aggravated the occurrence of frost damage, the reason may be that the film reduces the spread of the ground temperature, causing a lower space temperature, but also met with dramatic Cooling causes freezing damage.

There is also the problem of colonization of water. Most people are accustomed to planting water and easing seedlings to form two water systems. The amount of water is better. However, due to the large water content caused by this year, the rot is more serious, and there are a large number of sheds that cause low ground temperature due to large water volume. The slow seedling period was postponed by 10 to 15 days. Of course, there are also a lot of sheds that have a good effect. This is mainly related to soil quality and water quality.

Unlike greenhouses, greenhouses are not intuitive and can only be judged by the appearance of seedlings. One farmer misjudged the dry phase as a prolonged growth in nutrition, but it was a far cry from this. In general, whether the prosperous criterion is: The first flower opening should be 56 centimeters away from the top growth point. Above 5 or 6 centimeters, it can be judged as vegetative growth prolonged, and less than 5 or 6 centimeters can be determined as reproductive growth. Excessively prosperous, we usually say that the prosperous growth means excessive growth of nutrients. Although this principle is universal, it does not necessarily apply. Each household has different management methods and looks different from each other. Judging whether to prosper or not requires comprehensive judgment. Watering should also be carried out according to the appearance of the shed. Two sheds that need to be watered, and some plants still have to pick up the open flowers, otherwise it will affect the yield during the entire growth period. Although another shed was planted for the same period, the colonization water was too large, and there was tendency toward leggy, and it was absolutely impossible to water it again.

Now, in the period of colonization of tomatoes in the greenhouse, how much is the density? Should be determined according to the specific circumstances, in Feixiang County, the general situation is 1.1 to 1.2 meters wide, 0.33 meters spacing, if it is a large leaf species to reduce the density. For the early colonization, we should also increase the row spacing appropriately to avoid affecting normal growth under the conditions of low temperature and low illumination. The author has done a comparison in Qiantun Village. The output of 1.2 meters wide is 1 meter higher than that of the lotus, and the quality of tomatoes is also improved. In Guojiabu, some people increased the width of the temple to 1.3 meters. The effect was also good. Some people think that the higher the density is, the higher the yield is. Don't realize that the density is too high. After encountering low temperature and low light, the lower blade will not see the sunlight. It will not only produce nutrients, but also consume nutrients and easily invade gray mold.

From this point of view, no fixed crop pattern can be copied, no matter what kind of crop it is grown. No one can say that in the office, a high-yield model can be designed because the actual comprehensive conditions must be taken into account in order to achieve high output. The soil, water quality, species, time, weather, and the structure of the shed and the management level of the people, each condition is a variable, each variable affects the yield and efficiency. If these factors are not taken into consideration, it would be difficult to achieve the desired results. The art of war said that he knows oneself and knows oneself, he does not fight every battle, and so does vegetable cultivation.

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