Long-term lime and phosphogypsum broadcast affects phosphorus cycling in a tropical Oxisol cultivated with soybean under no-till

Author(s)

Firmano, Ruan Francisco ^[1] ; Colzato, Marina ^[1] ; Bossolani, Joao William ^[2] ; Colnago, Luiz Alberto ^[3] ; Martin-Neto, Ladislau ^[3] ; Ferracciu Alleoni, Luis Reynaldo ^[1]

Affiliation

^[1] Univ Sao Paulo, Luiz Queiroz Coll Agr ESALQ, Soil Sci Dept, Padua Dias Av, 11, BR-13418000 Piracicaba, SP - Brazil

^[2] Sao Paulo State Univ UNESP, Coll Agr Sci, Dept Crop Sci, Jose Barbosa Barros St 1780, BR-18610034 Botucatu, SP - Brazil

^[3] Embrapa Instrumentat, Xv Novembro St 1452, BR-13560970 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: NUTRIENT CYCLING IN AGROECOSYSTEMS; v. 120, n. 3, p. 307-324, JUL 2021.
• Web of Science Citations: 1

Abstract

Broadcast application of lime or phosphogypsum to suppress aluminum (Al) in soils can influence chemistry and fate of phosphorus (P) in natural environments. However, the long-term effects of these amendments in organic P (P-o) forms and in soil biochemical properties remain unclear. This study assessed the effect of lime and phosphogypsum management on P-o contents, soil biochemical properties, and soybean (Glycine max L.) nutrition and yield. The long-term field experiment was carried out in highly weathered soil under no-till in southeastern Brazil. Soil chemical properties commonly used in soil fertility assessments were severely influenced by Al-suppressors broadcast over time. Changes in soil chemical attributes affected nutrient concentrations in soybean index leaves and grain yield, which was higher when lime was associated to phosphogypsum. The presence of Al-suppressors in the soil influenced the activity of enzymes linked to P and carbon (C) cycles, mainly in the 0-20 cm layer. The pH was mostly influenced by the activity of phosphatases, especially in the limed soil. Myo-inositol hexakisphosphate (IHP6) was the second most abundant P form in the soil after orthophosphates, indicating crop litter P-inputs regulate the P-o cycle. Over time, soil management influenced the diversity and abundance of P-o forms measured by P-31 nuclear magnetic resonance (NMR) spectroscopy compared to soil under native vegetation. Differences were most significant for the proportions of deoxyribonucleic acid (DNA), myo- and scyllo-inositol hexakisphosphates, and alpha- and beta-glycerophosphates, which were higher in the soil under native vegetation. (AU)

• FAPESP's process: 18/11063-7 - LIME AND GYPSUM IN LONG-TERM EXPERIMENT IN NO-TILLAGE SYSTEM: QUALITY OF SOIL AND RECOVERY OF 15N-FERTILIZER BY CROPS
• Grantee: João William Bossolani
• Support type: Scholarships in Brazil - Doctorate
• FAPESP's process: 18/08586-8 - Broadcast application of limestone and phosphogypsum and the phosphorus forms of an oxisol under no-till
• Grantee: Ruan Francisco Firmano
• Support type: Scholarships in Brazil - Doctorate