Method for measuring decomposition rate and nutrient release rate of crop straw returning to field

A technology of crop straw and decomposition rate, which is applied in the direction of weighing by removing certain components, can solve the problem that the decomposition rate of straw and its nutrient release rate cannot be truly and objectively measured

Pending Publication Date: 2022-02-11
INST OF CEREAL & OIL CROPS HEBEI ACAD OF AGRI & FORESTRY SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In short, the existing method of returning straw to the field with nylon mesh bags and then washing the remaining straw with water cannot truly and objectively measure the decomposition rate of straw and its nutrient release rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Decomposition rate and nutrient release rate of wheat straw returned to the field after one corn season in the wheat-corn rotation planting system in North China:

[0033] (1) Wheat straw returning to the field

[0034] Cut the wheat straw into 3-5cm small sections, measure the percentage content of nitrogen, phosphorus and potassium nutrients in the wheat straw, respectively c N = 0.56%, c P2O5 = 0.37%, c K2O = 1.98%. Set up microplots in the field with an area of ​​0.3m 2 (0.5m×0.6m), according to the actual output of wheat straw covering the ground and returning to the field, the amount of straw returned to the field in the micro-area is 337.5g (calculated on a dry basis), and corn is planted in the micro-area.

[0035] (2) Pick up and return the residual wheat straw after 1 corn growing season (4 months)

[0036] After returning to the field for one corn growing season, pick up all the remaining straw (adhesive with soil) in the micro-area, and further remove t...

Embodiment 2

[0050] Determination of decomposition rate and nutrient release rate of corn stalks returned to the field for one year

[0051] (1) Corn stalks returned to the field

[0052] Cut the corn stalks into 3-5cm segments, measure the percentages of nitrogen, phosphorus and potassium in the stalks, respectively c N = 0.89%, c P2O5 = 0.32%, c K2O = 2.01%. Set up microplots in the field with an area of ​​0.3m 2 (0.5m×0.6m), according to the actual yield of corn stalks mixed with 0-20cm surface soil and then returned to the field, the amount of straw returned to the field in the micro-zone is 250.36g (calculated on a dry basis), and the straw returned to the field within one year to plant wheat- corn.

[0053] (2) Pick up the residual corn stalks after returning to the field for one year

[0054] After returning to the field for 1 year, pick up all the remaining straw (adhesive with soil) in the micro-area, and further remove the non-residual straw components such as crop roots an...

Embodiment 1

[0067] Embodiment 1 result application example:

[0068] The amount of straw returned to the field directly affects the quality of cultivation. Excessive amount of straw returned to the field will lead to deterioration of farming conditions and directly affect the planting and growth of subsequent crops. The decomposition rate of straw returned to the field can be used as an important basis for judging the amount of straw returned to the field, so the amount of straw returned to the field can be adjusted appropriately to achieve the purpose of promoting material circulation without affecting the cultivation quality. According to the amount of straw returning to the field and the release rate of straw nutrients, the release of straw nutrients after a period of time can be calculated, which can replace the amount of other nutrient sources to a certain extent. Therefore, crop nutrient management can be optimized based on this, and fertilization can be scientifically determined. I...

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Abstract

The invention discloses a method for measuring decomposition rate and nutrient release rate of crop straw returning to field, which belongs to the technical field of material recycling. The method is characterized in that in-situ returning to field replaces a nylon mesh bag method, and a drying and rolling 'secondary screening method' replaces an original 'clean water washing method'. The method can truly and accurately determine the straw decomposition rate and the nutrient release rate of the crop returning to the field, and is suitable for all agricultural ecosystems of straw returning to the field.

Description

technical field [0001] The invention relates to the technical field of material recycling, in particular to a method for measuring the decomposition rate and nutrient release rate of crop straws returned to the field. Background technique [0002] A large amount of crop straw is produced every year in the agricultural production system. In recent years, the annual output of major crop straw in China has exceeded 700 million tons. The nitrogen (N) and phosphorus (P 2 o 5 ), potassium (K 2 O) The total amount of nutrient resources is above 6 million, 2 million and 11 million tons respectively. Straw returning to the field is one of the most effective ways to utilize straw resources. On the one hand, straw returning can significantly increase soil organic matter, improve soil porosity, agglomeration, adsorption, buffering and other physical and chemical properties, improve soil water storage and fertilizer retention capacity, and ultimately improve cultivated land quality an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04
CPCG01N5/04
Inventor 张经廷吕丽华张丽华姚艳荣董志强贾秀领
Owner INST OF CEREAL & OIL CROPS HEBEI ACAD OF AGRI & FORESTRY SCI
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