Fertilizer requirements of sugarcane in texas
J.R.Thomas, A.W.Scottt, Jr., and R.P.Wiedenfeld 1985

テキサスにおけるサトウキビの窒素肥料要求性を調べるために、窒素肥料の量を変える、一括して施肥をする、分割して施肥をするといった条件でサトウキビの栽培実験を行った。
サトウキビの収量は植え付け栽培、株出し栽培において112kgN/haまで窒素肥料に強い応答性をみせたが、それ以上の施肥量では収量の大きな増加は見られなかった。窒素肥料の要求性は栽培品種によって異なった。また、分施はサトウキビ収量および砂糖収量に大きな影響を与えなかったものの、分施によりサトウキビの生育の後期に葉の窒素含量が増加することが、砂糖含量の減少につながった。

To everyone in Tropical Agriculture Laboratory,

On seminar of this week, Ken Ueda also will give a presentation.
Research plan and a precedence research will be refered.
Thank you.

B4 Ken Ueda

Precedence research
Fertilizer requirements of sugarcane in texas
J.R.Thomas, A.W.Scottt, Jr., and R.P.Wiedenfeld 1985

Several studies were conducted to determine the N fertilizer requirements of sugarcane in texas. Treatments varied among studies and included differnet rates of nitrogen fertilization, single and split applications. Sugarcane yields responded strongly to N fertilization in plant crop and ratoon crops up to 112 kgN/ha. Requirement to N fertilizer were affected by cultivars. Splitting the fertilizer applications did not significantly affecte cane or sugar yields.Increase in leaf N concentration were associated with decrease in sugar percent cane.