Impact of meteorological factors on Cd availability and average concentration prediction in rice growth cycle

Abstract

During the rice growth cycle, the average available cadmium concentration (C_A-Cd) in the soil determines the Cd content in rice plant. Given defined soil properties and rice varieties, the meteorological factors play a crucial role in soil's available cadmium concentration (C_Cd) during the rice growth cycle. Thus, it is significant to investigate the influence of meteorological factors in C_Cd during the rice growth cycle and develop a predictive model for C_A-Cd. The rice was cultivated under seven different sowing dates in Cd and As-contaminated soil in Hunan Province. Studied the impact of meteorological factors on paddy soil. The results showed that accumulated temperature (AT) and total precipitation (TP) were key factors affecting the soil C_Cd. The correlation coefficients between AT and TP with soil C_A-Cd were 0.98 and -0.94 (p < 0.01), respectively. However, there was no significant correlation with C_As. AT mainly influenced the C_Cd during the grouting and maturity stages. A straightforward empirical prediction model was developed, capable of accurately forecasting C_A-Cd during the rice growth cycle by considering meteorological factors and the initial soil C_Cd. This study supported a novel foundation for the precise prediction of Cd content in rice.

Keywords: Meteorological factors; Model; Rice; Soil cd; pH.