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Method for starting irrigating with greenhouse nutrient solution

A technology of nutrient solution and greenhouse, applied in the field of watering control of greenhouse crop nutrient solution

Inactive Publication Date: 2013-12-25
JIANGSU UNIV
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Problems solved by technology

The present invention proposes a novel nutrient solution management strategy, which can solve the problems of "when to irrigate" and "how much to irrigate" in the current nutrient solution management

Method used

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  • Method for starting irrigating with greenhouse nutrient solution

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Embodiment Construction

[0014] Taking the nutrient solution management of cucumbers cultivated in greenhouses as an example, a novel nutrient solution management strategy of the present invention is introduced in detail below, which includes the following three steps:

[0015] The first step is to determine the amount of nutrient solution per irrigation.

[0016] Suppose a greenhouse uses perlite to cultivate cucumbers, a total of 40 kg of perlite is used, and the number of cultivated cucumbers is 100, then each plant uses 400 grams of perlite. The amount of nutrient solution per watering can be calculated by the amount of nutrient solution absorbed by perlite and the amount of nutrient solution intercepted by the root system.

[0017] 1. Calculation of the amount of nutrient solution absorbed by perlite:

[0018] The amount of nutrient solution adsorbed by perlite is equal to the amount of perlite multiplied by the adsorption coefficient. In the present invention, the adsorption coefficient of perl...

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Abstract

The invention discloses a method for starting irrigating with a greenhouse nutrient solution. Transpiration E of crops is taken as daily water demand of the crops, and irrigation is started when the transpiration E of the crops is larger than or equal to previous irrigation amount of the nutrient solution. The transpiration E of the crops is calculated according to a formula that E=0.5XRn+1.5XRH-0.3, wherein E refers to the transpiration of the crops in mm, Rn refers to net radiation of accumulation in Mj / m, and RH refers to relative humidity. After irrigation, a radiation value of previous accumulation is cleared to zero. By the method, the problems about irrigation time and irrigation frequency of the nutrient solution are solved, emission of residual solution is reduced, operation cost is saved while pollution to the environment is reduced, and the method can be applied to starting bases of greenhouse nutrient solution irrigation.

Description

technical field [0001] The invention belongs to the field of protected horticultural cultivation, and in particular relates to the watering control technology of greenhouse crop nutrient solution. Background technique [0002] Compared with the traditional soil cultivation method, the advantage of soilless cultivation is that it can not only produce cheap pollution-free, green food to meet people's living needs, but also improve the efficiency of water and fertilizer use. The area of ​​soilless cultivation in my country has exceeded 3,000 hectares in 2011, and the area of ​​nutrient solution cultivation in the world has reached 402,981 hectares. However, there are not many studies on the regulation strategy of nutrient solution. At present, in order to ensure that the crops are not short of fertilizer, the greenhouse production in our country adopts the nutrient solution irrigation control strategy of increasing the fertilizer and water, that is, increasing the supply of fe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01G31/00
Inventor 倪纪恒付为国毛罕平陈大鹏
Owner JIANGSU UNIV
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