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Changes of Soil Nitrogen Supply and Production of Upland Forage Crops by Cattle Manure during Conversion from Paddy to Upland Condition in Paddy Field  

Seo Jong-Ho (National Institute of Crop Science, RDA)
Kim Sok-Oong (National Institute of Crop Science, RDA)
Publication Information
KOREAN JOURNAL OF CROP SCIENCE / v.50, no.6, 2005 , pp. 387-393 More about this Journal
Abstract
The effect of cattle manure with the rates of 2 and 4 ton $l0a^{-1}$ for winter rye and summer corn cultivation, respectively, on the dry matter (DM) yield and nitrogen (N) uptake were investigated during successive three­year conversion period from paddy to upland condition in paddy field. The changes in soil properties and soil N sup­plying capacity during repetitive manure application were a1so examined. Growth and DM yield of upland forage crops, especially. winter rye were hindered highly by poor soil condition in the first year after conversion from paddy to upland condition, so apparent recovery of cattle manure N by crops was very low in the first conversion year. But, DM yield and N uptake of upland forage crops were increased linearly by accumulative input of cattle manure along with mineral N enrichment in soil, which also increased apparent recovery of cattle manure-No It seemed that those increases were mainly due to the improvement of soil properties such as soil mineral N, soil organic matter (soil carbon), potentially mineralizable N and bulk density by accumulative input of cattle manure rather than the increase of soil N supply according to accumulative conversion period from paddy to upland condition. It was derived that conversion period from paddy to upland condition over 2 years is needed to obtain proper DM yield in paddy field and accumulative inputs of cattle manure during the conversion period is more influential to the continuous increment of DM yield and N uptake of upland crop as well as of potential N supplying capacity of soil.
Keywords
corn; rye; cropping system; conversion from paddy to upland; cattle manure; dry matter yield; nitrogen uptake;
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