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Key points what to focus on when to balance the radiation and temperature – 10 March 2021
In the previous articles, it was mentioned that due to the fluctuations in daily climate change in actual situation, if the relevant factors can be considered and added to the influences in the setting of the climate computer, it will help the plant growth balance.
The picture of “Plant Empowerment” (below) also illustrates the effects of heating strategies and light radiation on plant growth.
Learning the experience of Dutch growers is certainly important, but realizing data collection and analysis based on Chinese growers own situation is actually the first step to realize a customized temperature strategy.
Suggestion: draw a linear regression line:
- For this “outstanding” point, it is necessary for the grower to specifically analyze the cause behind it to see whether the temperature strategy still needs improvement (exceptions: such as extreme weather conditions).
- If such “outstanding” points appear frequently, it means that there are indicators/influences that need to be adjusted and discussed in the temperature strategy.
- If the data is recorded and the graph is drawn regularly, when the data samples are sufficient and combined with the actual production (quality or yield), the grower should be able to get an intuitive impression of whether the specified temperature strategy is good or bad which could be guideline for growers themselves.
Key points what to focus on when we talk about irrigation strategy 2/2 by Daisy Zhang – 5 March 2021
In the last chapter, we talked about the key points of operation and the “golden rule”.
The content of this chapter will mainly introduce, what are the concepts and goals to consider and weigh in the optimization and formulation of irrigation strategies in greenhouse planting, and what practical effects are such operations to achieve? Of course, all the operations and controls need to be adapted to the local conditions and situation, but always good to understand what the principles are.
First, we need to know why roots are playing an important role.
Second, 3 key aspects are mentioned: a. first drain need to achieved around 11.00am; b. a good range of the general drain percentage: 25-35%; c. try to keep the reduced weight of the substrate by about 15% at night to achieve oxygen supply to the root system.
Key points what to focus on when we talk about irrigation strategy 1/2 by Daisy Zhang – 3 March 2021
With the increasing popularity of modern horticulture, from modern Dutch Venlo-style glass greenhouses to high-efficiency solar greenhouses, how to think about specifying a better and more optimized greenhouse climate strategy is worth discussing. Especially in the current winter conditions, if the effective solar radiation in the area is limited, the outdoor temperature is low, and the greenhouse is not equipped with additional CO2 supply equipment, etc., it is more important to grasp the irrigation strategy than other environmental factors.
Several key points of control and manipulation during the wintertime will be discussed:
1) To regard the “golden rule” (3.0cc/joules) as a guideline, instead of a strict number.
2) The 3 main points when we talk about conducting a reasonable irrigation strategy with the Radiation influence:
– Each irrigation dose adjustment
– Influencing factor 1: How to control the time interval
– Influencing factor 2: how many joules of light accumulation trigger one irrigation
Key points when to control the greenhouse climate during wintertime by Daisy Zhang – 3 February 2021
The climate is gradually entering the deep winter. Most of the greenhouse vegetables transplanted in the autumn and winter are in the picking and harvesting period, and the vegetables planned to overwinter are mostly in the flowering and fruiting period. But if the temperature drops too low, the vegetables have the risk of cold pressure and chilling damage. If the greenhouse climate control and operation are not performed properly, it is easy to cause different levels of undesirable phenomena such as plant wilting, small fruits falling off, or deformity of fruits.
As a leading role of modern agricultural technology, smart glass greenhouses have certain advantages compared with traditional solar greenhouses when facing the winter weather such as haze, light snow, and strong winds. Of course, it is necessary to control and adjust the climate in the greenhouse based on the local environment, such as actual temperature and humidity, to meet the requirements of crops.
Several key points of control and manipulation during the wintertime will be discussed:
1. High indoors RH
2. How to heat the greenhouse
3. Extra CO2 supply plays a role in controlling temperature.
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