(15(1):1-7)水稻肥料分施與栽植密度對產量，產量構成因子及其他主要農藝性狀之效果（三）

The effects of 3 split applications of nitrogen and potash fertilizers and 2 planting densities on yield and some agronomic traits evaluated in the second crop of 1964 and the first crop of 1965 at Chiayi Agricultural Experiment Station are reported. Split fertilizations generally outyielded conventional one in both crop. The yield increase appeared to be due largely to the increase in either number of grains per panicle or grain weight. Grain yield was also increased by close spac-ing which was attributable to increase in the number of panicles per unit area. An evidence of interaction between fertilization and planting density was detected for grain yield in this experiment. The weight and length of panicles were significantly increased by split fertiliza-tions but decreased by close spacing. Heading date and plant height were not significantly affected by split fertilizations. Rice plant was shorter and headed earlier in plots of high planting density. 本文係報告嘉義農業試驗分所在民國53年第2期作及54年第1期作舉辦三種氮、鉀素肥料分肥法及兩種栽植密度對水稻產量、產量構成因素及其他農藝性狀效果之試驗結果。 肥料分施在第1、2期作產量其產量均較慣行法為佳，其增產原因為每穗粒數及（或）千粒重之增加。密植亦能增產，其產量之提高乃得自單位面積總穗數之增加。產量在肥料分施與栽植密度之間，有顯著之交感作用。 穗長、穗重皆因肥料分施而顯著增加，但隨栽植密度之增加而減少，生育日數與株高受肥料分施之影響較少。密植可縮短生育日數及減低株高。 稻莖第1及第2節間長度均因肥料分施而增加，惟其餘3節則見縮短。在密植區之稻莖各節之間長度均較疏植區者為短，稻田只發生輕微之倒伏，故其與稻莖節間之關係無法詳予考察