Effect of Organic Manure on Phosphorus Adsorption-Desorption and Availability in Paddy Soil Derived from Red EarthEnglish Full Text

NI WU-ZHONG;ZHANG YONG-SONG and SUN XI( Dept. of Soil Sci. and Agrochem., Zhejiang Agricultural Untversity, Hangzhou 310029 )(China)

Abstract: A field test with the traditional rotation of paddy rice/upland crop （wheat） was carried out on a paddysoil derived from red earth to elucidate the effect of organic manure on the phosphorus adsorption-desorptionby soil and its P availability Soil samples were taken from different treatments at rice harvesting stage andanalysed. The isothermal adsorption of P by the samples fitted very well with Langmuir equation, and hence,the parameters in the equation, i.e., maximum adsoaption （qm）, constant related to bonding energy （k） andtheir product （k x qm） could be used as a comprehensive index to characterize the potential P adsorptivityof the soil. Organo-inorganic fertilization and organic manuring conld decrease qm and k, while mineral P appli-cation had little effect on them. The isothermal desorption of P was significantly correlated with initiallyadded and isothermally adsorbed P. Part of P added was fixed, which represented the P fixation capacityof soil, and organic manuring could obviously lower the P fixation. The content of soil available P had asignificant negative correlation with qm, k and fixed P. It is concluded that organic manure could increase theP availability of paddy soil derived from red earth by decreasing qm, k, maximum buffering capacity （MBC=k x qm） and fixation capacity.

Keywords：

adsorption-desorption; availability; organic manure; paddy soil derived from red earth; phos-Phorus;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S141

Mobile Reading

Read on your phone instantly

Step 1
Scan QR Codes

"Mobile CNKI-CNKI Express" App

Step 2
Open“CNKI Express”

and click the scan icon in the upper left corner of the homepage.

Step 3
Scan QR Codes

Read this article on your phone.
CAJ Download
PDF Download

Effect of Organic Manure on Phosphorus Adsorption-Desorption and Availability in Paddy Soil Derived from Red EarthEnglish Full Text

NI WU-ZHONG;ZHANG YONG-SONG and SUN XI( Dept. of Soil Sci. and Agrochem., Zhejiang Agricultural Untversity, Hangzhou 310029 )(China)

Read on your phone instantly

Citation Network

Related Literature