| In order to clarify the suitable row spacing of wheat with different planting densities under early sowing,a field experiment with 2 planting density of basic seedlings 180×104 plants·hm-2 (D1) and 240×104 plants·hm-2 (D2) and 4 row spacing of 17 cm(R1),20 cm(R2),23 cm(R3) and 26 cm(R4) was conducted to study the effects of row spacing and density on the growth,photosynthesis and yield of wheat. The results showed that D1 density with R1 row spacing and D2 density with R2 row spacing under early sowing had the highest values of plant height,internode length,leaf chlorophyll content,leaf area index,population dry matter weight,photosynthetic rate,stomatal conductance,transpiration rate,canopy photosynthetical active radiation and yield of wheat. Under the same row spacing,the plant height,internode length，chlorophyll content,photosynthetic indexes at flower and filling stages of D1 were higher than that of D2,while the leaf area index,population dry matter weight,canopy photosynthetically active radiation,spike number and yield of D1 were lower than that of D2. So,the reasonable combination of planting density and row spacing can improve growth and achieve high yield of wheat under early sowing in Huaibei area of Anhui province. Under this experimental condition,the suitable basic seedling and row spacing for early sowing wheat were 240×104 plants·hm-2 and 20 cm,respectively. |
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