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Method for determining ecological stoichiometric ratios of lettuce at different growth stages

A technology of stoichiometric ratio and growth stage, which is applied in the field of nutrient regulation and efficient utilization in facility cultivation, can solve problems such as content increase and harm to health, and achieve the effects of improving quality, improving use efficiency and reducing environmental pollution.

Active Publication Date: 2019-06-07
JIANGSU UNIV
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  • Description
  • Claims
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Problems solved by technology

However, excessive fertilization will increase the content of carcinogens nitrate and nitrite in lettuce, which will seriously endanger people's health.

Method used

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  • Method for determining ecological stoichiometric ratios of lettuce at different growth stages
  • Method for determining ecological stoichiometric ratios of lettuce at different growth stages
  • Method for determining ecological stoichiometric ratios of lettuce at different growth stages

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Embodiment Construction

[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0030] The embodiment of the present invention proposes a method for determining the steady-state ecological stoichiometry of hydroponic lettuce, comprising the following steps:

[0031] 1. The division of different growth stages of lettuce (with the speed of leaf age growth rate as the index)

[0032] The implementation site is located in the temperature-controlled greenhouse (18-25°C) of Ji...

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Abstract

The invention discloses a method for determining the ecological stoichiometric ratios of lettuce at different growth stages, which belongs to the technical field of nutrient regulation and efficient utilization in protected cultivation. Based on the results obtained, the application of nitrogen and phosphorus nutrients in the growth process of lettuce can be controlled dynamically in total amountand proportion, so as to improve the efficiency of nutrient use and improve the quality of lettuce products. The method includes the following main processes: selecting the cumulative leaf age progress of lettuce as a growth rate index; determining the 'slow-fast-slow' growth stages of lettuce in the growth process according to the inflection points of a drawn 'S-shaped' cumulative growth curve; and measuring the ecological stoichiometric ratio of lettuce at each growth stage, and verifying the ecological stoichiometric characteristic conformity of the obtained results, so as to ensure the scientific nature of the results and dynamically control the fertilization management of lettuce.

Description

technical field [0001] The invention relates to a method for determining the ecological stoichiometric ratio of lettuce in different growth stages, and belongs to the technical field of nutrient regulation and efficient utilization in protected cultivation. Background technique [0002] Ecological stoichiometry is a science that studies the energy balance of ecosystems and the balance of multiple chemical elements, the contents of carbon (C), nitrogen (N) and phosphorus (P) in plants and their mutual ratios (N:P, C:N and C: P, that is, the ecological stoichiometric ratio) can be used as an indicator to judge the adaptation status of plant growth to nutrient supply. The homeostasis hypothesis and the allometric growth hypothesis are two important theoretical cornerstones for constructing ecological stoichiometry. Among them, the homeostasis hypothesis holds that organisms have the ability to maintain relatively stable chemical element composition and content in different env...

Claims

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Application Information

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IPC IPC(8): G01N33/00G01N33/02
Inventor 付为国薛珂张进权韦晨
Owner JIANGSU UNIV
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