ペースト肥料による局所施肥栽培がレタスの生育および品質に及ぼす影響  [in Japanese] Effects of Localized Deep Placement of Paste-Like Fertilizer on the Growth and Quality of Lettuce (Lactuca sativa L. var. crispa)  [in Japanese]

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Abstract

ペースト肥料を使用して,レタスの局所施肥栽培を実施し,施肥量の違いが生育や品質に及ぼす影響について検討した.またペースト肥料(ペースト区)の他に速効性の粒状肥料(化成区),被覆複合肥料(被覆区),なたね油かす(有機区)を使用して,実際に機械施肥で施用される施肥位置でレタスの側条施肥栽培を実施し,土壌中の無機能窒索の存在が硝酸含量に及ぼす影響を検討した.1)局所施肥栽培では慣行施肥に対して,20%から30%の減肥により,収量を落とすことなく,α値やアントシアニン含量,Brix示度が増加した.その一方で硝酸含量が低下したことから,減肥により成分品質の向上を認めることができた.しかし標準施肥量以上の過剰な施用は硝酸含量の蓄積が顕著であった.2)側条施肥栽培では20%の減肥を行った全ての処理区(化成区,ペースト区,被覆区および有機区)で慣行区と収量が同等であり,硝酸含量が低下した.その傾向は被覆区や有機区で顕著に示された.この一因として土壌中の無機能窒素に占めるアンモニア能窒素の割合が高く,硝酸化成に遅れが生じたため,硝酸能窒素の吸収が抑制されたものと考えられた.

To evaluate the effect of localized deep placement of paste-like fertilizer, the growth and quality of lettuce (Lactuca sativa L. var. crispd) were examined in potted plants receiving different application rates of paste-like fertilizer, compared to standard fertilization using a compound fertilizer (standard, N, P_2O_5 and K_2O applied to the soil at a rate of 120 mg kg^<-1> respectively). When the paste-like fertilizer was applied at a rate that was 20-30% less than the standard, the dry matter production of lettuce could be comparable to that for the standard treatment. The content of red color tone, anthocyanin and Brix soluble solids in lettuce grown with paste-like fertilizer treatment applied at a 20-30% reduction rate was higher than that in lettuce grown with standard treatment, while the nitrate content was lower than that in plants grown with standard treatment. Therefore, these results suggested that localized deep placement of paste-like fertilizer might improve the quality of lettuce and reduce the rate of fertilizer application. When four kinds of fertilizer, i.e. compound fertilizer, paste-like fertilizer, coated fertilizer and rapeseed cake, were applied as side dressing treatment at a rate 20% less than the standard treatment in the container experiment, N uptake by lettuce receiving the side dressing treatments did not significantly differ from that in the standard treatment irrespective of the kinds of fertilizer. However, the nitrate content in lettuce grown with the side dressing treatment was lower than that in plants grown with the standard treatment. This tendency was especially remarkable with coated fertilizer and rapeseed cake treatments. The soil applied as side dressing promoted delayed nitrification; therefore it was considered that the reason for the decrease in nitrate in lettuce grown with side dressing treatment, especially coated fertilizer and rapeseed cake, was that the rate of nitrate uptake was relatively decreased, while that of other nitrogen forms, mainly ammonium, was increased.

Journal

  • Japanese Journal of Soil Science and Plant Nutrition

    Japanese Journal of Soil Science and Plant Nutrition 75(4), 431-438, 2004

    Japanese Society of Soil Science and Plant Nutrition

References:  30

Cited by:  4

Codes

  • NII Article ID (NAID)
    110001755250
  • NII NACSIS-CAT ID (NCID)
    AN00195767
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0029-0610
  • NDL Article ID
    7059432
  • NDL Source Classification
    ZR7(科学技術--農林水産--農産)
  • NDL Call No.
    Z18-331
  • Data Source
    CJP  CJPref  NDL  NII-ELS  IR  J-STAGE 
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