Effects of nitrogen fertilizer on the CO_2 flux from calcareous soil under sugarcane cultivation

DOI JASI Web Site 26 References

Bibliographic Information

Other Title
  • 窒素質化学肥料の施肥とサトウキビ栽培石灰質土壌からのCO_2フラックスおよび浸透水水質との関係
  • チッソシツ カガク ヒリョウ ノ セヒ ト サトウキビ サイバイ セッカイシツ ドジョウ カラ ノ CO ₂ フラックス オヨビ シントウスイ スイシツ ト ノ カンケイ

Search this article

Abstract

This study was carried out on Miyako Island, a coral island in southwest Japan, to clarify the effect of nitrogen fertilizer application on CO_2 flux from the surface of a calcareous soil on which sugarcane is cultivated. A compound fertilizer (N:P_2O_5:K_2O(%) =18:10:14), in which the main nitrogenous fertilizer was ammonium sulfate, was applied twice, in May and July, during the period of sugarcane cultivation from April 2009 to January 2010. The amounts of nitrogen applied were 6.75 gm^<-2> in May and 7.25 gm^<-2> in July. We measured the CO_2 flux by using a dynamic closed chamber system. We also measured the amount and composition of percolate sampled by a funnel-type lysimeter with a 60-cm column of soil in the field. In the period after either fertilizer application, heavy rain events, or both, from the plots in which fertilizer was applied was 1.2 to 2.3 times the CO_2 flux than in the plots without fertilizer application. The amounts of Ca^<2+>, HCO_3^-, NO_3^-, and H^+ in the percolate of the fertilized plots were significantly higher than in those that were not fertilized. The amount of Ca^<2+> was significantly positively correlated with HCO_3^-, NO_3^-, and H^+ in the fertilized plots. These results suggested that carbonates in the calcareous soil were dissolved by H+ supplied from the nitrification of ammonium in the applied fertilizer, and some of the CO_2 derived from the dissolution was emitted from the surface of the field.

Journal

References(26)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top