Effects of Green Manure-Maize Rotation on Phosphorus Uptake of Crop and Decrease in Phosphorus Accumulation in Organic Upland Soil

Abstract

Phosphorus (P) easily accumulates in farmland soil due to their high affinity to cations and clay, and thus their use efficiency of crop is low. Green manure-maize rotation system might be an efficient measure to reduce P accumulation in organic farmland by improving P uptake of crops. This study was conducted to investigate the effects of green manure-maize rotation on P uptake of maize and excess P removal in organic upland soils. Maize mono cropping and green manure-maize rotation systems (barley (B), hairy vetch (H), mixture of B and H) were established in organic farmland, and the experiments were conducted for 2 years without additional nutrients application. Green manure had a significant impact on maize grain production. Maize P uptake increased with the increased rate of hairy vetch seeding. Water soluble P content in soil was further reduced in green manure-maize rotation systems compared to the mono cropping. The results suggest that green manure-maize rotation system (except barley) without nutrient supplement increases P uptake of maize and thus decreases soil P accumulation.

Visual analysis of Chinese and international green manure research based on bibliometrics

“…(5) Green manure rotation Green manure plants can be rotated with cash crops, i.e., after the cash crops are harvested in autumn, green manure crops are planted in the winter fallow period to increase the ground cover of winter farmland. This can effectively reduce the ground exposure of the soil during the fallow period and help to reduce the impact of wind and water erosion on soil quality (LEE et al, 2020;HUANG et al, 2016). Campanella et al (CAMPANELLA et al, 2020) showed that Brassica crop rotations can reduce the occurrence of wheat root rot.…”