为了实现可持续的作物生产力,改善土壤健康,增加了土壤中的碳(C)固存,保护性农业(CA)在印度次大陆越来越多地得到推广和采用。然而,因为来自世界不同地区的一些研究人员报告说,相对于基于常规耕作(CT)的农业,CA下的作物产量降低,根据印度已发表的研究进行了荟萃分析,以评估CA对农作物产量的影响,土壤有机碳的积累作为土壤健康的指标,以及全国不同地区和土壤质地组土壤中的碳固存。荟萃分析基于来自印度的35种出版物在CA和CT下的544个配对观察,使用MetaWin2.1软件进行。结果显示与CT相比,在CA下作物产量总体显著(p<0.05)降低1.15%。年度数据显示,从2009年到2016年,CA下的收益率有所下降,但从2017年到2020年有所上升。在东部观察到产量下降,东北,和印度的南部地区,但在西部,北方,和该国的西北地区,在CA而不是CT下观察到增加.沙质壤土和黏性土壤在CA下的作物产量高于CT。与CT相比,CA下土壤有机碳含量和土壤碳固存分别增加8.9%和7.3%,分别。此外,在所有区域和土壤质地组中,CA下土壤有机碳积累和土壤碳固存均高于CT下。降雨等因素,土壤深度,有效氮(N),和总氮显著影响了CA条件下的产量增减和土壤有机碳积累。总的来说,荟萃分析的结果表明,在印度推广CA必须考虑到作物的特定位置,土壤属性,和气候条件。
In the quest of achieving sustainable crop productivity, improved soil health, and increased carbon (C) sequestration in the soil, conservation agriculture (CA) is increasingly being promoted and adopted in the Indian subcontinent. However, because some researchers from different regions of the world have reported reduced crop yield under CA relative to agriculture based on conventional tillage (CT), a meta-analysis has been conducted based on published research from India to evaluate the effects of CA on the yield of crops, accumulation of soil organic C as an index of soil health, and C sequestration in the soil in different regions and soil textural groups in the country. The meta-analysis is based on 544 paired observations under CA and CT from 35 publications from India was carried out using Meta Win 2.1 software. The results showed an overall significant (p < 0.05) reduction of 1.15% crop yield under CA compared to CT. Yearwise data showed a reduction of yields under CA from 2009 to 2016, but an increase from 2017 to 2020. Yield reduction was observed in the eastern, north-eastern, and southern regions of India but in western, northern, and north-western regions of the country, an increase was observed under CA rather than CT. Sandy loam and clayey soils exhibited higher crop yield under CA than under CT. Compared to CT, soil organic C content and soil C sequestration under CA increased by 8.9% and 7.3%, respectively. Also, in all the regions and soil textural groups both soil organic C accumulation and soil C sequestration were higher under CA than under CT. Factors such as rainfall, soil depth, available nitrogen (N), and total N significantly influenced the extent of yield increase/decrease and soil organic C accumulation under CA. Overall, results of the meta-analysis suggest that the promotion of CA in India will have to be location-specific taking into consideration the crops, soil attributes, and climatic conditions.