【摘要】 研究了鲁原单4号早熟玉米夏播的叶片数、积温、生育期和适宜追肥期,结果表明,叶片总数是相对稳定的,一般为17～18片,叶片伸展期所需天数和积温,平均8d与220℃左右,全生育期83～85d,积温2100℃以上。最佳追肥期为叶指35.3,适宜追肥期为叶指17.6～52.9,土壤肥力高或施用基肥的,取适宜范围的上限,土壤肥力低或长势弱的,取适宜范围的下限。更多还原

【Abstract】 This paper studies the leaves numbers,accumulated temperature,growing period and appropriate topdressing period of the Luyuandan No.4,summer early-maturing maize,results showed that the total number of leaves was relatively stable,usually 17～18 films,days and accumulated of blade extended period temperature was an average about 8 d and 220 ℃,the whole growth period 83～85 d,accumulated temperature above 2 100 ℃.The best top-dressing period of 35.3 leaves that was suitable for top dressing period of leaf mean 17.6～52.9,soil fertility,high or basal fertilizer application,took appropriate range,low soil fertility or crop was growing weaker took the lower limit of suitable range.更多还原