マルチ内施肥によるトンネル春夏どりニンジンの減肥栽培 Effects of Nitrogen Fertilizer Levels as Related to Application Method under Plastic Mulch on Growth and Yield of Carrot
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春夏どりニンジン栽培において,うね間部分の施肥を省略する減肥栽培(マルチ内施肥)を検討した.また,マルチ内施肥,播種およびマルチ張りのために,これらを一行程で行うことができるようにシーダマルチャと施肥機を組み合わせたマルチ内施肥機を作製した.マルチ内施肥では,1.0kg・a^<-1>の窒素施肥量で,全面全層施肥(2.0kg・a^<-1>)と同等の収量を得ることができた.また,マルチ内施肥によって施肥窒素利用率は全面全層施肥の35%に対して61%に向上し,収穫後にほ場に残存する乾上1kg当たりの硝酸態窒素は全面全層施肥の80mgに対して20mgと少なかった.これらのことから,本施肥法はより少ない肥料で収量を確保し,土壌中の残存窒素も少なくする有効な施肥法であると考えられた.
A comparison was made between broadcast application and row application with mulching in respect of efficiency of nitrogen fertilizer uptake and on the yield of carrots. The row fertilizing, sowing and mulching were managed in one cultural system utilizing improved combination of fertilizer applicator, seeder and mulcher. Carrot seeds were sown in an Andosol field in February 1999 and 2000, and a Cambisol field in February 2001. The plants were grown in plastic tunnels until rnid-April at which time they were uncovered; they were harvested in June. No significant difference in the yield was observed between broadcast application (N: 2.0 kg・a^<-1>) and row application (N: 1.0 kg・a^<-1>) but the nitrogen fertilizer efficiency was 61% in the row application, compared to 35% for broadcast application. Residual nitrate nitrogen in field subsoil after harvest in the row application was only 25% of in the broadcast application. It is concluded that for carrot production, a row application of 1.0 kg・a^<-1> resulted in a good yield with low amount of residual nitrate nitrogen in the soil.
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- 園芸学会雑誌
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園芸学会雑誌 72(5), 432-439, 2003-09-15
園芸学会