The responses of weed communities to field nutrients and their ecological benefits in rice fields: A review

Abstract

While traditionally perceived as yield-reducing elements in rice (Oryza sativa L.) cultivation, weed communities in paddy fields play a crucial role in the ecosystem. These communities, when selectively retained, can significantly enhance ecosystem services. This review examines the impact of various weed communities on rice in different paddy fields, their response to field nutrients, and the ecological benefits they offer. These benefits include nitrogen retention, promotion of microbial diversity, and reduction of diseases, pests, and weed proliferation. Examples of such benefits are seen in weeds like Lemna minor L. and Azolla imbricata (Roxb.) Nakai, which help in nitrogen fixation and act as biocontrol agents against harmful pests. However, current research in this area faces challenges, including the lack of intelligent and precise weed control technologies, comprehensive green control strategies, and expertise in weed management. Our findings suggest a strategic approach to weed control in paddy fields, emphasizing the importance of preserving weed species that have minimal impact on rice yields but offer significant ecological advantages. These practices can lead to grass-mediated weed control and enhanced nutrient absorption, thereby reducing fertilizer loss. Ultimately, this approach could reduce the reliance on chemical fertilizers and herbicides in paddy fields, laying the groundwork for greener rice cultivation and sustainable agricultural practices.