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Review
. 2024 Jan 5:14:1172689.
doi: 10.3389/fpls.2023.1172689. eCollection 2023.

Study of the utilization of main crop straw resources in Southern China and its potential as a replacement for chemical fertilizers

Guiting Mu  1 , Lifu Xu  2 , Jiachun Zhang  3
Affiliations
Review

Study of the utilization of main crop straw resources in Southern China and its potential as a replacement for chemical fertilizers

Guiting Mu et al. Front Plant Sci. .

Abstract

Although straw returning to the field (SRTTF) is conducive to promoting sustainable agricultural production and protecting the environment, straw resources are still wasted due to the lack of suitable straw-returning technology in southern China. Based on the statistical yearbook and a large number of studies, different methods were used to calculate the total straw resources and SRTTF potential, and differences in these methods were compared. The results indicate that the total amount of straw resources in southern China in 2021 was 3.35×108 t. The nutrient content of K2O in the straw accounted for the highest proportion of total nutrient resources (63.66%), followed by N (26.88%) and P2O5 (9.46%). In theory, total SRTTF could replace almost all K2O and part of N and P2O5, indicating that the nutrient substitution potential of SRTTF was high. It is suggested that the SRTTF method be adopted in the middle and lower reaches of the Yangtze River, which mainly uses direct returning (DR) supplemented by indirect returning (IDR). In southeast China, straw returning is carried out by the combination of IDR and IR. In southwest China, straw returning is mainly carried out by IR and supplemented by MDR. This study will provide theoretical support for the government to formulate straw-returning policy.

Keywords: quantity of straw; K2O; P2O5; chemical fertilizer; nitrogen; nutrient.

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Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

Figure 1
Figure 1
Overview map of the study area.
Figure 2
Figure 2
Distribution of straw resources of major crops in different regions of southern China in 2021.
Figure 3
Figure 3
Nutrient demand and yield of main crops in provinces of southern China in 2021.
Figure 4
Figure 4
The replaceable amount of nutrients of main crops in straw returning to the field per unit sown area for cities in southern China in 2021 (kg/hm2). MLRCR (The middle and lower reaches of the Yangtze River).
Figure 5
Figure 5
The theoretical straw nutrient replacement fertilizer rate of each province and autonomous region in southern China in 2021. MLRCR (The middle and lower reaches of the Yangtze River).
See this image and copyright information in PMC

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