Availability of a partially acidulated rock phosphate (PARP) to rice, corn and soybean under field conditions: I. preliminary results

Authors

  • E. Malavolta USP; E.S.A. Luiz de Queiroz; Departamento de Química
  • G.C. Vitti UNESP; Faculdade Ciências Agrárias e Veterinárias
  • J.C. Alcarde USP; E.S.A. Luiz de Queiroz; Departamento de Química
  • C.A. Rosolem UNESP; Faculdade Ciências Agrárias
  • D. Fornasieri Fº UNESP; Faculdade Ciências Agrárias e Veterinárias

DOI:

https://doi.org/10.1590/S0071-12761981000200016

Abstract

In slightly acidic soils the effect of two rates of PARP (60 and 120 kg P2O5 per hectare) was compared to that of single superphosphate and of the original ground Araxá rock phosphate (ARP), both supplied to give 90 kg P2O5/ha. Testcrops were: upland rice, corn and soybeans. Main conclusions, based on yield data, and soil and leaf analyses were the following: (1) there was no statistical diferrence between yields obtained with PARP and SS which, however, were ussuallu higher than those provided for by ARP; (2) results from chemical analyses show that the PARP, as well as the SS, were a source of P, Ca and S to the three crops; (3) under the experimental conditions, there fore, the effect of the PARP was close to that of the SS rather than to the effect due to the ARP.

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Published

1981-01-01

Issue

Vol. 38 No. 2 (1981)

Section

nd2042836149

How to Cite

Malavolta, E., Vitti, G., Alcarde, J., Rosolem, C., & Fornasieri Fº, D. (1981). Availability of a partially acidulated rock phosphate (PARP) to rice, corn and soybean under field conditions: I. preliminary results . Anais Da Escola Superior De Agricultura Luiz De Queiroz, 38(2), 801-818. https://doi.org/10.1590/S0071-12761981000200016