Accumulation of phosphate in greenhouse soils planted with small-fruited watermelons in Ibaraki prefecture

DOI JASI Web Site 6 Citations 36 References

Bibliographic Information

Other Title
  • 茨城県内の小玉スイカ栽培ハウス土壌におけるリン酸蓄積の実態
  • イバラキ ケンナイ ノ コダマ スイカ サイバイ ハウス ドジョウ ニ オケル リンサン チクセキ ノ ジッタイ

Search this article

Description

Soil chemical properties in greenhouses planted with small-fruited watermelons, and especially phosphate content, were investigated by conducting soil analyses in 32 greenhouses in Chikusei City, Ibaraki Prefecture, where sudden wilt disease occurs frequently. Although application rates for nitrogen and potassium fertilizers were similar to those recommended for Ibaraki Prefecture, the amount of phosphate applied was approximately twice the recommended rate. The amounts of phosphate and potassium in the compost applied for soil amendment were more than 60% of the levels recommended for fertilizers, and this accounts for the surplus nutrients. The soils of the greenhouses were Andosols, and virgin Andosols in the region exhibit strong acid reactions and a lack of exchangeable bases and available phosphate. Conversely, pH(H_2O), degree of base saturation, base balances, and available micronutrients in the greenhouse soils were considered suboptimal for watermelon culture. Mean nitrate nitrogen content in the plow layer reached 200mgkg^<-1>. Interestingly, despite being an Andosol, the mean available phosphate content in the plow layer was 1950mgP_2O_5kg^<-1>, approximately 20% of which was water-soluble. The greenhouses had been used for continuous cropping of small-fruited watermelon for 40 years. Their soils had total phosphate concentrations of 4.36MgP_2O_5ha^<-1> that had accumulated to soil depths of 60cm and exhibited markedly decreased phosphate absorption coefficients and soluble aluminum. A marked accumulation of soil nutrients (and particularly nitrate nitrogen and phosphate) were observed in the greenhouses used to cultivate small-fruited watermelons.

Journal

Citations (6)*help

See more

References(36)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top