Effects of Biostimulant NEAU10 on Growth of Rice Seedlings and Soil Physicochemical Parameters

The process of rice （Oryza sativa L.） seedling cultivation is often subjected to adverse environmental stress.Biostimulants regulate the robust growth of rice seedlings and play a crucial role in promoting the green and ecological development of agriculture.In this study,1.0 and 2.0 g · m^-2 of the biostimulant were applied to soil in rice seedbeds.Growth indicators of rice,antioxidant enzyme activities and soil physicochemical characteristics were assessed at the 2.5-leaf and 4-leaf stages of rice.The results indicated that applying 2.0 g · m^-2 of the biostimulant at both the 2.5-leaf and 4-leaf stages had the most significant promoting effect on rice growth.At the 2.5-leaf and 4-leaf stages,the number of fibrous roots increased by 23.43% and 22.25%,stem base width increased by 19.05% and 19.58%,above ground dry weight increased by 18.09% and 16.47%,root dry weight increased by 19.67% and 18.28%,leaf peroxidase （POD） activity increased by 34.44% and 42.94%,superoxide dismutase （SOD） activity increased by 37.24% and 56.79%,malondialdehyde （MDA） content decreased by 18.60% and 27.67%,and chlorophyll content increased significantly by 28.31% and 34.24%,respectively.At the 4-leaf stage of rice,urease,phosphatase and cellulase activities in the seedbed soil increased by 42.13%,25.96% and 33.59%,respectively,while soil alkaline nitrogen,available phosphorus and available potassium content decreased by 19.76%,19.02% and 17.88%,respectively.The application of biostimulants played a crucial role in promoting the growth of rice seedlings and enhancing soil nutrient absorption.