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Title Transcription
ソクジョウ シヒ サイバイ 二 オケル ペースト シリョウ ノ チッソ ソセイ ノ チガイ ガ ホウレンソウ ノ ショウサン ガンリョウ 二 オヨボス エイキョウ
Title Alternative (English)
Effects of Differences in the Nitrogen Composition of Paste-Like Fertilizer Applied as Side Dressing on Growth and the Nitrate Concentration of Spinach (Spinacia oleracea L. var. crispa)
Author
Mishiro, Yasuhiro Grad. Sch. Agric. Sci., Tottori Univ.
Description
粒状化成肥料の慣行施肥(全面全層施肥)を対照とし,窒素組成の異なる3種類のペースト肥料(尿素複合ペースト肥料,有機態窒素50%配合ペースト肥料,有機態窒素100%配合ペースト肥料)を施用して,ホウレンソウの側条施肥栽培を実施し,生育や硝酸含量に及ぼす影響について検討した。また同肥料の洗浄培養試験を実施し,土壌滲出水中の窒素成分の溶出経過やペースト肥料の粘性の違いから,硝酸化成や環境負荷に及ぼす影響についても検討した。1)ホウレンソウの収量や窒素吸収量に処理区間の差異は認められなかった。2)有機態窒素の配合割合が高い有機ペースト肥料ほど,粒状化成肥料の慣行施肥や尿素複合ペースト肥料の施用と比較して,硝酸含量が低下した。3)有機ペースト肥料は尿素複合ペースト肥料よりも,肥料の粘性が高く,また施肥窒素の溶出量や栽培跡地の硝酸態窒素の移動量は低かった。特に有機態窒素の溶出量は著しく低下した。4)以上より,有機態窒素の配合割合が高い有機ペースト肥料の施用は,粒状化成肥料および尿素複合ペースト肥料の施用よりも,土壌中での硝酸化成に遅れが生じるため,作物の硝酸態窒素の吸収を抑制したと考えられた。また施肥窒素の流亡が抑制され,環境負荷の軽減にも有効であると推察された。
Description Alternative
To evaluate the effects of differences in nitrogen composition in paste-like fertilizers applied as side dressing, growth and nitrate concentration of spinach (Spinacia oleracea L. var. crispa) grown in containers were examined and compared to standard fertilization using a compound fertilizer (standard, N, P_2O_5 and K_2O applied to the soil at a rate of 120mg kg^<-1>). Three kinds of paste-like fertilizer, which differ in nitrogen source, i. e. urea, a 1:1 mixture of urea and residual liquid with fermented molasses (RLFM) and RLFM, were applied to the soil as side dressing at a rate that was 20% below the standard. Dry matter production and N uptake in spinach treated with paste-like fertilizers was comparable to that treated with standard fertilizer, while the nitrate concentration in spinach treated with paste-like fertilizers was lower than that treated with standard fertilizer. Among the paste-like fertilizers, the nitrate concentration in spinach decreased with the increasing rate of RLFM, in which the major N sources were composed of proteins and amino acids. To understand the possible explanation for better growth and low nitrate concentration in spinach treated with paste-like fertilizer despite the lower application rate, N concentrations of ammonium, nitrate and organic N were assessed temporally by leaching water from fallow plots. At the initial time of incubation, the nitrate concentration in the leaching water from the standard fertilizer was higher than that from paste-like fertilizer treatments. The paste-like fertilizer composed of urea, however, showed a higher concentration of organic N which was supposed to be urea. The fertilized-N of the standard and paste-like fertilizer composed of urea might be immediately eluviated by irrigation. However, N concentration in the leaching water after treatments with paste-like fertilizer composed of RLFM was lower than that of the former treatments, suggesting that fertilized-N might remain localized. The amount of N eluviated during incubation showed a negative correlation with the viscosity of the paste-like fertilizer. The highest viscosity was observed in the paste-like fertilizer composed of RLFM, followed by a 1:1 mixture of urea and RLFM, and the paste-like fertilizer composed of urea was the lowest in viscosity. Therefore, it was suggested that the paste-like fertilizer composed of RLFM or a 1:1 mixture of urea and RLFM showed limited N leaching due to the high viscosity. Therefore, spinach could take up N efficiently.
Subject
側条施肥
ペースト肥料の窒素組成
硝酸
ホウレンソウ
nitrate
nitrogen composition of paste-like fertilizer
side dressing
spinach
Journal Title
Japanese Journal of Soil Science and Plant Nutrition
Volume
76
Issue
6
Start Page
849
End Page
857
ISSN
0029-0610
ISSN(Online)
2424-0583
Published Date
2017-06-28
DOI
Publisher
一般社団法人 日本土壌肥料学会
Publisher Transcription
イッパン シャダン ホウジン ニホン ドジョウ ヒリョウ ガッカイ
Publisher Aalternative
Japanese Journal of Soil Science and Plant Nutrition
NII Type
Journal Article
Format
PDF
Text Version
出版社版
Gyoseki ID
e3915
OAI-PMH Set
Faculty of Life and Environmental Science
Remark
http://jssspn.jp/index.html
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