かん水同時施肥栽培におけるコーンスティープリカーおよびメタン消化液の利用がメロンの生育および収量に及ぼす影響(土壌管理・施肥・灌水)  [in Japanese] Effects of Corn Steep Liquor (CSL) and Methane Fermented Liquid Cattle Waste (MFC) Application in Fertigation Soil Culture on Growth and Yield of Muskmelon (Cucumis melo L.) Fruit (Soil Management, Fertilization & Irrigation)  [in Japanese]

化学肥料を基肥として用いる無機基肥区,液肥用化学肥料を用いる通常のかん水同時施肥区(無機養液区)および有機性液肥を用いる有機養液区の3処理を設定してメロンを栽培し,生育と果実品質に及ぼす影響を検討した.有機養液区にはCSL(実験1)とメタン消化液(実験2)を用いた.液肥用メタン消化液には酢酸を添加し,リン酸やカルシウムなど肥料成分を可溶化した.実験1では3処理区中CSL区の収量および可溶性固形物含有率が最も低かった.CSLのみを液肥として用いる有機義液土耕はメロンの栽培法として問題があると考えられた.実験2では,通常の栽培とほぼ同等の収量および可溶性固形物含有率の果実を得ることが示された.これは,メタン消化液の窒素成分の70%が無機態窒素であるため,初期の肥効が確保され,初期の生育が良好であったためと考えられた.

The effects of applying corn steep liquor (CSL) and methane fermented liquid cattle waste (MFC) on yield and sugar content of muskmelon fruit in organic fertigation culture were examined in comparison with conventional basal dressing of chemical fertilizer and traditional inorganic fertigation culture. CSL is a byproduct of corn starch factories. It is a viscous liquid and contains about 30 g kg^<-1> each of N, P_2O_5 and K_2O. MFC was added to acetic acid (finally 48g kg^<-1>). This treatment dissolved phosphate and calcium, and established inorganic concentrations in the liquid at 4.9g kg^<-1> of N, 2.2g kg^<-1> of P_2O_5 and 3.6g kg^<-1> of K_2O. In experiment I, yield and sugar content of melon fertilized with CSL were lowest among the treatments. These results suggested that it is difficult to cultivate muskmelon using only CSL, because of the slow and low release of nitrogen from CSL is inadequate for muskmelon production. In experiment II, yield and sugar content of melon fertilized with MFC improved and were almost the same as that of melons raised under other treatments. This is because MFC consists of 70 % of inorganic nitrogen in total N, which is more suitable than CSL for early growing muskmelon. Greater leaf area caused by faster N supply led to the improvement of yield and sugar content in organic fertigation.