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Farmland test method of grading index of soil nutrient

A soil nutrient and field test technology, applied in the field of agricultural science and technology, can solve the problems of long time, many test points, low test accuracy, etc., and achieve the effect of avoiding test errors, high test accuracy and improving reliability.

Active Publication Date: 2014-12-24
INST OF COTTON RES CHINESE ACAD OF AGRI SCI
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Problems solved by technology

[0005] Therefore, it is of great significance to establish a field test method that can overcome the problems of many test points, time-consuming, and low test accuracy in the existing soil nutrient classification index field test technology, and is simple, feasible, and high test accuracy.

Method used

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  • Farmland test method of grading index of soil nutrient
  • Farmland test method of grading index of soil nutrient
  • Farmland test method of grading index of soil nutrient

Examples

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Effect test

Embodiment 1

[0030] In this example, the following method was used to obtain the grading index of soil available phosphorus in cotton fields in northern Henan.

[0031] 1. By planting cotton for one year without applying phosphorus fertilizer, the available phosphorus consumption in the soil of the test site is reduced to a lower level

[0032] The annual soil available phosphorus content in the test site was 7.2mg / kg. In order to meet the test requirements, no phosphorus fertilizer was applied to the test site in the previous year to plant cotton; after one year of cotton planting, the available soil phosphorus content in the test site was reduced to 2.1mg / kg.

[0033] 2. According to theoretical calculation, for every increase of 1mg / kg in the soil available phosphorus content in the 0-20cm soil layer, 0.15kg P should be applied per mu (that is, P 2 o 5 0.34kg), considering factors such as the fixation of phosphorus in the soil, 0.22kg P (that is, 0.5kgP 2 o 5 )calculate. The random ...

Embodiment 2

[0045] In this example, the following methods are used to obtain the grading index of soil available potassium in cotton fields in eastern Henan.

[0046] 1. By not applying potassium fertilizer and using wheat-cotton interplanting, the available potassium consumption in the soil of the test site is reduced to a lower level

[0047] The soil available potassium content in the test site last year was 53 mg / kg. In order to meet the test requirements, no potassium fertilizer was applied to the test site in the previous year. Wheat was planted and cotton was interplanted. After harvesting, all straws were removed from the test site; The soil available potassium content in the test field was reduced to 42mg / kg in the same year.

[0048] 2. According to theoretical calculation, for every 1mg / kg increase in the available potassium content in the soil in the 0-20cm soil layer, 0.15kg K (that is, 0.18kgKK) should be applied per mu. 2 o). The random block arrangement of the experiment...

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Abstract

The invention relates to a farmland test method of the grading index of a soil nutrient. The method comprises the following steps that: (a) a farmland with a low nutrient content is selected or one-season to two-season plants are planted in the farmland without applying the nutrient fertilizer to consume the nutrient to the lowest content level; (b) the farmland is randomly divided into different treatment plots, and different application rates of the nutrient fertilizer are set to adjust the nutrient in soil of each treatment plot to different levels; (c) after the fertilizer is decomposed and transformed in the soil of each treatment plot, the content of the nutrient in the soil of each treatment plot is determined; (d) a farmland test is conducted to obtain the yield and the relative yield of each treatment plot; and (e) a regression equation between the nutrient in the soil and the relative yield of the crop is established, and the corresponding grading index of the soil nutrient is calculated according to a relative yield method. The method provided by the invention is simple and feasible, the regional soil nutrient grading index can be established within a short period, and a lot of manpower and material resources can be saved.

Description

technical field [0001] The invention relates to the field of agricultural science and technology, in particular to a field test method for grading indicators of soil nutrients. Background technique [0002] At present, the soil nutrient classification index, also known as the soil nutrient abundance index, is mainly used to evaluate the soil nutrient level in the process of crop fertilization recommendation, and determine the amount of fertilization accordingly. To put it simply, in farmland with strong soil nutrient supply capacity, less fertilizer can be used to meet the needs of healthy crop growth, and vice versa, more fertilizer (nutrients) is needed. [0003] Soil nutrient classification index is determined according to the correlation between soil nutrient measurement value and crop yield, and soil nutrient index is usually classified according to the relative yield method. The relative yield refers to the ratio of the economic yield of the plot without applying a ce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/24
Inventor 董合林李鹏程刘爱忠李如意
Owner INST OF COTTON RES CHINESE ACAD OF AGRI SCI
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