On the relative merits in vegetable crop production practices with and without fertilizers and chemicals

[Author abstract]Concerning several pulse crops and root crops, their growth and yield were compared with crop plants grown on fertilized and non-manured farm, and the qualities of the crops, nutritive and physiological properties were determined by way of partial analysis of living plants. The results of the investigation are given hereunder. 1. It is discovered that generally speaking, the growth of pulse crops and root crops grown on the non-manured farm was somewhat delayed, and the vegetative growth period was shortened, and there was a tendency that they got in reproductive stage earlier. Moreover, the yields of their crops were less by 30% as compared with those of the fertilized farm. 2. In reference to the quality of the harvested plants of the root crops, extremely superior crops were obtained in the non-manured farm, although their yields were rather small, and the sizes of crops were widely dispersed. It became evident, moreover, that the crops of the non-manured farm contained a smaller quantity of rough protein in general. On the contrary, there was a tendency that the contents of sugar were higher.[著者抄録]数種の果菜類および根菜類について,施肥圃場と無施肥圃場との生育,収量などを比較し,品質については一部生体分析により,栄養生理学的な裏付けを行なった。その結果,(1)共通して無施肥圃場では生育が遅延し,栄養生長期間が短縮され,早く生殖生長期に入る傾向があり,また,収量も概して低く,おおむね施肥栽培の30%以下であった。(2)品質では,根菜類において,無施肥栽培で少量ながら極めて優れたものを産したが,収穫物のばらつきが大きかった。なお,無施肥栽培の収穫物は共通的に粗蛋白含量が少なく,逆に全糖含量が多い傾向が認められた。(3)無施肥栽培でのダイコンの形態は,地下部に比べ地上部で小さく,葉色も淡かったが,根部における糖含量及び辛味成分の含量は高い傾向にあった。記念特集