P Pools After Seven-Year P Fertiliser Application Are Influenced by Wheat Straw Addition and Wheat Growth

Abstract

Little is known about the effect of long-term P fertilisation on soil P pools and how they are influenced by straw addition and plant growth. Two experiments were carried out with soil which had been amended with 0, 10 and 20 kg P ha −1 for 7 years (referred to 0P, 10P, 20P). In experiment 1, soil was incubated moist for 4 months without or with 5 g kg −1 barley straw (C/P 255). Then wheat was grown for 4 weeks. In experiment 2, wheat was grown for 5, 10 and 15 weeks. HCl P, citrate P, resin P and microbial biomass P (MBP) were twofold higher with 20P and 10P than 0P. After 4 months compared to 10 days, HCl P and citrate P were 25% lower with straw, but unchanged without straw. Resin P and MBP were twofold higher. With 10P and 20P after 4-week wheat growth, citrate P was 25% higher and HCl P 25% lower. Plant P uptake was higher with straw, In experiment 2 after 10 and 15 weeks compared to the start at 10P and 20P, HCl P and citrate P were reduced by 20%. Plant P uptake was smaller than the decrease in HCl and citrate P. The greater P uptake by wheat in soil with straw indicates that microbial biomass P is an important P source for plants. In P amended soil, wheat mobilised HCl and citrate P, but only took up a fraction of the mobilised P.

Straw Incorporation Coupled with Deep Placement of Nitrogen Fertilizer Improved Grain Yield and Nitrogen Use Efficiency in Direct-Seeded Rice

“…In addition, Yang et al (2020) reported that complete decomposition of straw leads to the enhancement release of straw C and N into the soil which improved soil nutritional condition. However, Hoang and Marschner (2019) found that straw addition could decrease available N, compared with without straw addition. In present study, straw incorporation coupled with deep placement of N fertilizer treatment substantially improved the NRE and NAE.…”

Combined Effects of Straw Returning and Chemical N Fertilization on Greenhouse Gas Emissions and Yield from Paddy Fields in Northwest Hubei Province, China

“…Crop straw is one of the important organic fertilizers, which can increase available C and N in the soil and improve soil physicochemical properties (Wang et al 2015;Hoang and Marschner 2019). But straw returning observably affects CH 4 emissions from rice fields (Ma et al 2009;Zhang et al 2015).…”

Effects of Compound Microbial Fertilizer on Soil Characteristics and Yield of Wheat (Triticum aestivum L.)

“…Therefore, phosphorus and potassium are often the main elements that limit crop growth and yield. Although chemical fertilizers can provide phosphorus and potassium for plant, the utilization efficiency is low (Hoang and Marschner 2019). Moreover, chemical fertilizers with long-term use will cause groundwater and environmental pollution.…”