Effects of Paddy Soils from Different Parent Materials on Yield and Nutrient Uptake Characteristics of Double-Cropping Rice

Abstract

Parent materials of paddy soils are various in double-cropping paddy fields of Hunan Province. Investigation of the effects of paddy soils from different parent materials on yield and nutrient uptake characteristics of double-cropping rice will provide references for rational regional distribution and high yield cultivation of double-cropping rice in Hunan Province. Yield and nutrient uptake characteristics of double-cropping rice were analyzed using paddy soils from different parent materials in a 7-year experiment in Changsha, Hunan. The results indicated that, different paddy soils had very significant influence (P0.01) on yield of early rice and total yield of double-cropping rice, but no significant influence on yield of late rice. Yields of early rice and double-cropping rice were higher in red yellow clayey soil and alluvial sandy soil, with average yields (2009–2011) of 6896.9 kg ha?1 and 6908.3 kg ha?1 for early rice and 14 308.0 kg ha?1 and 14 446.3 kg ha?1 for double-cropping rice, respectively. Grey clayey soil and purple clayey soil were not beneficial to increasing yields of early rice and double-cropping rice. Average yields of early rice for the two treatments were only 6217.0 kg ha?1 and 6180.2 kg ha?1, and those of double-cropping rice were 13 635.4 kg ha?1 and 13 274.5 kg ha?1, respectively. The nutrient uptake traits of double-cropping rice varied with different paddy soils. Nitrogen uptake of double-cropping rice was higher in red yellow clayey soil, yellow clayey soil and alluvial sandy soil. Grey clayey soil was not beneficial to phosphorus uptake. Correlation analysis indicated that, nitrogen and potassium uptake of early rice had a positively significant correlation (P0.05) with yield of early rice, and nitrogen uptake of double-cropping rice had a significantly positive correlation (P0.05) with yield of double-cropping rice. Differences of physical and chemical properties in paddy soils from different parent materials were the main reason caused differences of yield and nutrient uptake in double-cropping rice.