玉米不同群体对产量及其构成因素的影响

The Effect of Different Corn Poputation on Yield and Its Components

本文从不同施肥量和不同字植密度出发，对玉米不同群体内的叶面积指数，透光率，干物质积．累，群体生长率及各产量因素进行了研究分析。结果表明：１．在本地的土壤及气候条件下，纯Ｎ２４０ｋｇ／ｈａ，最适种植密度是５．０～７．３万株／ｈａ；纯Ｎ９０ｋｇ／ｈａ时，最适种植密度是４．５～６．６万株／ｈａ。２．在纯Ｎ２４０ｋｇ／ｈａ的高肥条件下。产量的决定因素不是单位面积内的构数，而在纯Ｎ９０ｋｇ／ｈａ的低肥条件下，除应重视单位面积内的穗数外，更应注重穗粒数的提高，获得高产。３．高产群体的最适叶积指数是在３．０～４．５之间，且叶面积指数大于３．０的时间应在３８ｄ以上。４．生育后期果穗部的透光率至少应在１５％以上，基部透光率达２—３％，方可获得高产。５．灌浆期叶片Ｎ素含量的最适值为３．２６％最大群体产量可达９４５８．３纯ｋｇ／ｈａ．

According to different apptication rate of fertitizer and different planting density,different poputation cornts tea f area index, tight trasmission radio,poputation growth rate and factors determining yield were studied and analysed.The resutt showed 1.Vnder tocat soit and ctimate,optimum ptanting density is fifty～seventy-three, optimum ptanting density is at thousand perha.2.Vnder high-fertifizing,at pure N 240kg/ha.determinative factor of vietd is vnit area's spike number t under tow-fertitiiing at pure N 90kg/ha.the more importomt factor is to improve number of grains uprear,to obtain high-yietd production 3.High yietd POputation's optimum ted f area index is between 3.0-4,5,the time of tea f area index more than 3.0 shqutd be more than 38 days 4.At the end of growth period,when corn ear's light trasmission ratio shoutd be at teast more than 15% and proximat's light shoutd be 2-3%, you can obtain high-yietd production 5.The optimum of 10 in tea f at filling penod is 3.26%, maximat poputation yietd can reach to 9458.3kg/ha.