Optimizing Soil and Fertilizer Phosphorus Management According to the Yield Response and Phosphorus Use Efficiency of Su
- PDF / 538,673 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 47 Downloads / 176 Views
ORIGINAL PAPER
Optimizing Soil and Fertilizer Phosphorus Management According to the Yield Response and Phosphorus Use Efficiency of Sugarcane in Southern China Qihua Wu 1 & Wenling Zhou 1 & Diwen Chen 1 & Andong Cai 2 & Junhua Ao 1 & Zhenrui Huang 3 Received: 11 November 2019 / Accepted: 17 March 2020 # Sociedad Chilena de la Ciencia del Suelo 2020
Abstract The objective of this study was to determine the suitable range of available phosphorus (P) and fertilizer application rate in a sugarcane-growing region with red soil in southern China. Thirty-five monitoring sites were selected to investigate the soil available P in relation to crop yield, P-use efficiency (PUE) and soil total P under four different P rates. Compared with the no-P treatment, all three treatments involving fertilizer P presented sugarcane yields increased to varying extents, with an average increase of 17.6–25.8%. The yield-increasing effects and PUE in each P treatment decreased with increasing soil available P. The agronomic critical values of available P for sugarcane according to the linear-linear, linear-plateau and Mitscherlich models were 27.7, 41.5 and 17.0 mg kg−1, respectively. When the response of the yield-increasing effects of P fertilizer to soil available P and the agronomic critical values of the three models were combined, the linear-linear model exhibited the best fit. An observable change occurred in the available P response to total P. After the change point, the available P increased dramatically with increasing total P, possibly leading to decreased PUE or even triggering water pollution. Therefore, 28–50 mg kg−1 is the suggested range of suitable soil available P for the sugarcane-growing region. In addition, when the soil P budget and current relatively high level of available P are considered, applications of P fertilizer at 120 kg P2O5 ha−1 (1/2 the conventional P fertilizer rate) are recommended in this region. Keywords Yield-increasing effect . Critical value of available P . PUE . Soil P budget
1 Introduction Sugarcane (Saccharum officinarum L.), the most important sugar crop species worldwide, is also a crucial energy and * Junhua Ao [email protected] * Zhenrui Huang [email protected] 1
Guangdong Provincial Bioengineering Institute (Guangzhou Sugarcane Industry Research Institute)/Guangdong Key Laboratory of Sugarcane Improvement and Biorefinery, Guangzhou 510316, China
2
National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
3
Crops Research Institute, Guangdong Academy of Agricultural Sciences/Guangdong Provincial Key Laboratory of Crop Genetics and Improvement, Guangzhou 510640, China
forage crop species. China is the third largest sucroseproducing country after Brazil and India, and Guangxi, Yunnan, Guangdong and Hainan are the main sugarcane production areas. In recent years, natural disasters, insect pests and diseases, and over-fertilization have become the main li
Data Loading...
