Effects of Water-retaining Agents on Growth, Development, Yield and Quality of Soybean under Drought Stress

[Objectives]The paper was to explore the effects of different doses of water-retaining agent on the growth and development indicators,yield and quality of soybean plants subjected to drought stress.[Methods]The effects of drought stress(MDS)and drought stress with low(MDS-L),medium(MDS-M)and high doses(MDS-H)of the water-retaining agent on the growth and development indicators,root activity,MDA content,antioxidant enzyme activity,yield and quality of soybean were studied by field plot test,with the normal water supply serving as the control(CK).[Results]In response to drought stress,the plant height,stem diameter,and yield of soybean exhibited a notable decline.Additionally,the contents of protein,fat,linoleic acid,and linolenic acid in seeds demonstrated a significant reduction.Conversely,the root activity and antioxidant enzyme activity exhibited a noticeable decline,while the MDA content exhibited an increase.The application of varying doses of the water-retaining agent was found to significantly enhance soybean growth,stimulate root activity,and elevate antioxidant enzyme activity,while concurrently reducing MDA content.The observed effects were found to be dose-dependent,with the greatest effects observed at the highest dose.In comparison to MDS,the yields of soybean in the MDS-L,MDS-M,and MDS-H treatments exhibited a 18.38%,25.58%,and 46.26%increase,respectively.Additionally,the content of protein,fat,linoleic acid,and linolenic acid in seeds demonstrated a notable enhancement.[Conclusions]The application of the water-retaining agent has been demonstrated to significantly promote the growth of soybean plants under conditions of drought stress,resulting in an improvement in both the yield and the quality of the soybean crop.The recommended dosage of the water-retaining agent is 3.3 kg/667 m 2.

Driving forces and prediction of urban land use change based on the geodetector and CA-Markov model:a case study of Zhengzhou,China

Exploring urban land use change is a classical problem in urban geography.Taking Zhengzhou as an example,this paper analyzes the spatial and temporal characteristics and driving factors of urban land use change,and simulates the spatial pattern of urban land use in the future.The results of the study show that the land use types in Zhengzhou city were mainly farmland and construction land,the area of forestland,grassland,water area,and unused land was smaller,and the main land use change was the transformation of farmland into construction land.The accuracy check of the simulated land use type data in 2020 showed that the kappa coefficient reached 0.9445,which met the accuracy requirement.Then,according to the predicted land use data in 2025,it was found that the area of grassland,construction land,and water area may have decreased,and the area of farmland,forestland and unused land may have increased.Based on the driving force analysis of land use changes,its prediction results can provide an important reference basis for the formulation and planning of policies related to urban construction.