• 作者： 施景垣; 張和; 楊遜謙; 吳育郎
• 作者服務機構： 中央研究院植物研究所; 臺灣省農業試驗所嘉義分所; 臺灣省高雄區農業改良場
• 中文摘要： 為求增加二期稻之產量，本試驗用光學及掃描電子顯微鏡，觀察水稻之幼穗之分化，並於幼穗分化初期在葉面噴施含有三種成份的混液，它包括1％尿素、50 ppm之Sodium naphthaleneacetic acid及Nitrophenol（或稱果收生長素「利多生」）3,000倍之稀釋液，以期增加每株穎花數。試驗在屏東、嘉義、南港以該地最適秈梗品種各一，配合兩種栽培密度做噴施與不噴施之比較試驗。結果顯示在疏植情況下，於幼穗分化初期噴施混液一至二次，有助於增加每株穗數，從而增加產量，其增加量依疏密植及栽培地區而異。疏植之下噴施可增產6～20％，密植之下噴施可增產2～11％，相同處理在一期作環境下效果較不顯著，但最高亦可增產8％。
• 英文摘要： Field trials on the effect of foliar applica-tion of fertilizers and growth regulators on therice plant were carried out at Pin-Tong, Chia-Yee and Nankang area. In each location, twovarieties, one Japanica type and one Indica typewere employed. Light microscopic and scan-ning electron microscopic examinations on shootapex were used to determine the time of panicleinitiation. Foliar spraying of the mixture of1% urea, 50 ppm Sodium naphthalene aceticacid and dilute nitrophenol（1：3000) were ap-plied at the early stage of panicle initiation.The testing chemicals promoted the paniclenumber, and the yield 6-12％ and 2-11％ atlow and high cultivation density respectively.Less significance on yield by the applicationwas found on the 1st rice crop than on the 2ndrice crop. However, 8％ increasing in yieldwas observed in some trials.
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