Improvement of paddy soil derived from glassy volcanic ash (Shirasu) by successive applications of organic and inorganic amendments

Autor:	Naoko Nishizono, Yukihiro Kamimura, Kouji Furue
Rok vydání:	1994
Předmět:	chemistry.chemical_classification Phosphorus Amendment food and beverages Soil Science chemistry.chemical_element Plant Science Straw engineering.material Soil management chemistry Agronomy Soil water engineering Paddy field Organic matter Fertilizer
Zdroj:	Soil Science and Plant Nutrition. 40:39-48
ISSN:	1747-0765 0038-0768
DOI:	10.1080/00380768.1994.10414276
Popis:	A field experiment has been carried out since 1975, in order to maintain a high yield of rice cultivated in a paddy soil derived from glassy volcanic ash (Shirasu) which has potentially low productivity. In this experiment, farmyard manure or rice straw was applied as organic amendment, and slag and calcium silicate as inorganic amendments. The response of rice yield to the organic treatments was resulted of a large quantity of grains per panicle in the plots supplemented with farmyard manure, while by a high percentage of ripened grains in the plots treated with rice straw. The percentage of ripened grains in the organically treated plots, however, was lower than the plots treated with chemical fertilizer. The total carbon and nitrogen contents of the soils increased through successive applications of organic matter, resulting in a high carbon-nitrogen ratio. The amount of available phosphorus measured by the Truog and Bray No. 2 methods also increased through the application of farmyard manure....
Databáze:	OpenAIRE
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