Utilization of apatite in fresh volcanic ash by pigeonpea and chickpea

Yasuo Nakamaru, Masami Nanzyo, Shin Ichi Yamasaki

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Volcanic ash from Mt. Pinatubo, Philippines (1991) contained 1.7 g P2O5 kg−1 of P mostly as apatite. Dissolution of this apatite was significantly increased by (1) low pH (< 4.5) and (2) the existence of chelating organic acids in soil. Pigeonpea (Cajanus cajan (L.) Millsp.) and chickpea (Cicer arietinum L.) were selected as test plants to examine the possibility of utilizing apatite in the Pinatubo volcanic ash because of their ability to exude chelating organic acids. These two plants were grown in a greenhouse with and without P application. N was applied as NH4+ or NO3 to examine the effect of N forms on plant growth and on pH in the volcanic ash (NH4 plots, NO3 plots). Lower pH and higher soil solution P concentration were observed in the NH4 plots than in the NO3 plots of pigeonpea. In the NH4 plots, dry matter yield of pigeonpea without P was similar to that with P. Dry matter yield of chickpea grown in the NO3 plots without P was 75% of that in the P-amended plots. Soil solution pH of the NO3 plots was maintained between 7 and 8, and the citric acid concentration of the soil solution was mostly higher in the NO3 plots without P than in the NH4 or P-amended plots for both plants. It was suggested that plant P uptake in the NO3 plots without P was caused by organic add exudation by these plants.

Original languageEnglish
Pages (from-to)591-600
Number of pages10
JournalSoil Science and Plant Nutrition
Volume46
Issue number3
DOIs
Publication statusPublished - 2000

Keywords

  • Apatite
  • Chickpea
  • Organic acid
  • Pigeonpea
  • Volcanic ash

ASJC Scopus subject areas

  • Soil Science
  • Plant Science

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