NITROGEN SUPPLYING ABILITY OF PADDY SOILS UNDER FIELD CONDITIONS IN THE PHILIPPINES

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概要

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• The nitrogen supplying ability of paddy soil in the tropics was studied in a Maahas clay soil under field conditions in the Philippines and in two other soils in a pot experiment. The amount of soil nitrogen that was mineralized in one rice cropping season was estimated via incubation tests of these soils under laboratory conditions. The soil supplied nitrogen continuously throughout the period of plant growth, and this nitrogen played a crucial role in the growth and yield of the rice plant. The amount of nitrogen mineralized during a cropping season of rice was estimated to be between 60 and 80 kg/ha in Maahas clay soil depending on the season. The relatively lower mineralization rate during the dry season could be because the temperature was lower at the early stages of plant growth during this season than at the other times of the year. In both the wet and dry seasons, up to 27 kg N/ha was taken up by the plant between panicle initiation and the heading stage in both nitrogen-receiving and no-nitrogen plots. Apparently, there are various types of patterns of mineralization of soil nitrogen in tropical regions. The incubation test using soils under similar conditions proved useful in estimating the amount of nitrogen mineralized and the pattern of mineralization during a cropping season.

• 社団法人日本土壌肥料学会の論文

著者

• Ventura Wilbur

  The International Rice Research Institute

• SHIGA Hito-ichi

  The International Rice Research Institute

• Shiga Hito-ichi

  The International Rice Research Institute:(present Address)central Agricultural Experiment Station

関連論文

• PLANT ASSOCIATED N_2 FIXATION (C_2H_2-REDUCTION) BY FIVE RICE VARIETIES, AND RELATIONSHIP WITH PLANT GROWTH CHARACTERS AS AFFECTED BY STRAW INCORPORATION
• GROWTH INHIBITION DUE TO CONTINUOUS CROPPING OF DRYLAND RICE AND OTHER CROPS
• NITROGEN SUPPLYING ABILITY OF PADDY SOILS UNDER FIELD CONDITIONS IN THE PHILIPPINES
• IMPROVEMENT OF PHOSPHATE FERTILIZER APPLICATION TO Azolla
• ^N DILUTION TECHNIQUE OF ASSESSING THE CONTRIBUTION OF NITROGEN FIXATION TO RICE PLANT
• INVOLVEMENT OF NEMATODES IN THE SOIL SICKNESS OF A DRYLAND RICE-BASED CROPPING SYSTEM
• DRY SEASON SOIL CONDITIONS AND SOIL NITROGEN AVAILABILITY TO WET SEASON WETLAND RICE
• NITROGEN FIXATION ASSOCIATED WITH DEEPWATER RICE
• DISTRIBUTION, AND UPTAKE BY RICE PLANTS OF ^N-LABELED AMMONIUM APPLIED IN MUDBALLS IN PADDY SOILS
• Mineralization of Azolla N and Its Availability to Wetland Rice : II. Fertilizer Effect and ^N Uptake by Rice from Different Species of Azolla with Varying N Contents

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