播期、密度和行距对BNS型杂交小麦光合及产量的影响

为筛选BNS型杂交小麦的适宜播期、密度和行距配置,设置了3个播期10月5号(A1)、10月15号(A2)、10月25号(A3)]、3个密度基本苗150×104株·hm~(-2)(B1)、225×104株·hm~(-2)(B2)、300×104株·hm~(-2)(B3)]和3个行距18.3cm(C1)、23cm(C2)、宽窄行13.3/23cm(C3)],研究了播期、密度和行距配置对小麦光合特性及产量的影响。结果表明,杂交小麦旗叶净光合速率在所有测定时期均以A2B1C2处理最高,A2B3C1处理次之;通过极差分析可知,旗叶叶绿素a和叶绿素b含量的最佳处理为A2B3C2;三因素对小麦冠层透光率的影响程度因时期和部位而不同;A2B3C1和A3B3C2处理的产量显著高于其余处理。因此,在本试验条件下,杂交小麦适宜的播期、基本苗和行距分别为10月15号、300×104株·hm~(-2)和18.3cm。

Effect of Sowing Date,Density and Row Spacing on Photosynthetic Characteristic and Yield of BNS Hybrid Wheat

In order to clarify the suitable sowing date,density and row spacing of BNS type hybrid wheat,a field experiment with three sowing dates October 5(A1),October 15(A2),and October 25 (A3)],three planting density of basic seedling150 × 104 plants · hm-2 (B1),225 × 104 plants · hm-2 (B2),and 300× 104 plants · hm-2 (B3)]and three row spacing 18.3 cm(C1),23 cm(C2),and 13.3/23 cm(C3)]was conducted to study the effects of sowing date,density and row spacing on photosynthetic characteristic and yield of BNS hybrid wheat.The results showed that the net photosynthetic rate of hybrid wheat in all tested period were the highest in A2B1C2,followed by A2B3C1;the best combination of chlorophyll a and chlorophyll b in hybrid wheat flag leaf was A3B3C2;the transmittance of A2 was highest in the upper and middle part,and the bottom transmittance was decreased with the delay of sowing date,and the light transmission of the three parts was the highest in C2 row spacing;the yield of hybrid wheat in A2B3C1 and A3B3C2 was significantly higher than that of others;therefore,the suitable combination of sowing date,basic seedling and row spacing was October 15,300 × 104 plants · hm-2 and 18.3 cm under the conditions of this experiment.