Effects of 42-year long-term fertilizer management on soil phosphorus availability, fractionation,adsorption–desorption isotherm and plant uptake in flooded tropical rice

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Effects of 42-year long-term fertilizer management on soil phosphorus availability, fractionation,adsorption–desorption isotherm and plant uptake in flooded tropical rice

Pratap Bhattacharyya [et al.] - Nama Orang;

Soil phosphorus (P) fractionation, adsorption, and desorption isotherm, and rice yield and P uptakewere investigated in flooded tropical rice (Oryza sativa L.) following 42-year fertilizer and manure application. The treatments included low-input [unfertilized control without N, P, or K (C0N0)], farmyard manure (FYM) (C1N0), NP (C0NP), NPK (C0NPK), FYM + NP (C1NP), and high-input treatment, FYM + NPK (C1NPK). Grain yield was increased significantly by 74% over the control under the combined application of FYM + NPK. However, under low- and high-input treatments, yield as well as P uptakewas maintained at constant levels for 35 years. During the same period, high yield levels and P ptakeweremaintained under the C0NP, C0NPK,and C1NPK treatments. These are unique characteristics of a tropical flooded ecosystem,which is a self-sustaining system for rice production. The Fe–P fraction was highest compared to the Ca–PandAl–P fractions after 42 years of fertilizer application andwas significantly higher under
FYM + NPK treatment. The P adsorption capacity of soil was highest under the low-input treatment and lowest under long-term balanced fertilization (FYM + NPK). In contrast, P desorption capacity was highest under NPK and lowest in the control treatment. Long-term balanced fertilization in the form of FYM + NPK for 42 years lowered the bonding energy and adsorption capacity for P in soil but increased its desorption potential, increasing P availability to the plant and leading to higher P uptake and yield maintenance.

Keywords:
Long-term fertilization Phosphorus adsorption Phosphorus desorption Phosphorus fractionation Tropical rice

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Judul Seri: T H E C R O P J O U R N A L
No. Panggil: -
Penerbit: : Elsevier., 2015
Deskripsi Fisik: T H E C R O P J O U R N A L 3 ( 2 0 1 5 ) 3 8 7 – 3 9 5
Bahasa: English
ISBN/ISSN: -
Klasifikasi: -
Tipe Isi: -
Tipe Media: -
Tipe Pembawa: -
Edisi: -
Subjek: KIMIA
Info Detail Spesifik: -
Pernyataan Tanggungjawab: Wati/Agus

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FULL TEXT:Effects of 42-year long-term fertilizer management on soil phosphorus availability, fractionation,adsorption–desorption isotherm and plant uptake in flooded tropical rice

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