Usage of Slow Acting Nitrogen Fertilizers before Planting Tea Plant
スポンサーリンク
概要
- 論文の詳細を見る
In this study, the amount and placement of crotonylidene diurea (CDU) manuring before tea planting were investigated in comparison with those of ammonium sulphate. The results obtained are summarized as follows.<BR>1. In autumn planting, the CDU manuring before planting showed little better growth than the divided manuring of ammonium sulphate. The difference of growth by the amount of CDU manuring was not evident.<BR>2. In spring planting, it was confirmed that the effect of the manuring of CDU before planting was better than that of the divided manuring of ammonium sulphate, and the additional manuring between spring and autumn could be omitted, and the suitable amount of nitrogen was 20 kg per 10 a.<BR>3. Considering the result that was examined about the relationship between the amount of manuring and electric conductivity of soil solution, the manuring of CDU had shown low value of electric conductivity at first stage, but a high value was indicated according to decomposition process.<BR>It was feared that the large quantity of manuring of CDU would cause a density trouble.<BR>A high value of electric conductivity in soil solution was shown in manuring of ammonium sulphate, so a small quantity (about 10 kg/10 a) of its manuring caused a density trouble and tea plants withered.<BR>4. It seemed that the manuring of CDU caused a trouble when tea plants were kept contact wtih CDU, but otherwise it did not. The deep placement of ammonium sulphate withered the plants, and the placement around the root prevented the growth of plants.
- 日本茶業技術協会の論文