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在一定密度下,水稻从分蘖期每穴茎蘖数达11～13个时开始表现边际效应;当每穴茎蘖数达15个后,边际效应更为明显。边行最高茎蘖数、成穗率、有效穗,穗粒数和穗实粒数均高于内行,因而边行产量也显著高于内行。边际效应主要表现为增穗增粒,尤以增穗最为明显。边际效应仅表现在边1行,边2行已无边际效应。小区不除边行计产受边际效应影响大,不能反映试验的真实结果。株型松散、叶片披垂的品种边际效应大于株型紧凑、叶片直立的品种,不除边行计产则不能反映出品种间相对产量水平的差异。
Under a certain density, the marginal effect began to appear when the number of stems and tillers was 11 to 13 in each tillering stage. When the number of stems per shoot was 15, the marginal effect was more obvious. The maximum number of tillers, spike rate, effective spikes, grains per spike and grains per spike in line height were higher than those in line, so the yield of border line was significantly higher than those in line. The main effect of the marginal effect of increased by the ear granulation, especially by the most obvious ear. The marginal effect is only shown in side 1 and side 2 with no marginal effect. Residential area does not exclude the edge of the line by the marginal effect of large, can not reflect the true test results. The plant type is loose, the marginal effect of leaf draping is bigger than that of plant type, and the leaves are vertical. The difference of relative yield of different varieties can not be reflected.