| Under field conditions, two inter planting patterns, ‘522 pattern’ and ‘952 pattern’, of Xindong20 and Shenyu2002 were compared, and Baomai10 and Liyu35, Baomai10 and Denghai3672, Xindong20 and Liyu35, were compared with ‘521 inter-planting pattern’ mainly for the yield, leaf are
a, photosynthetic potential and dry matter accumulation. The results showed that the annual yield was increased for the ‘522 pattern’ (17 838.2 kg·hm-2) of Xindong20 and Shenyu2002 by 7.8%, as compared with the ‘952 pattern’ (yield 16 550.9 kg·hm-2). For winter wheat, the yield increased by 18.4%. The annualproduction of ‘521 pattern’ of Baomai10 and Liyu35, Baomai1
0 and Denghai3672, Xindong20 and Liyu35 were 19 905.0～20 751.0 kg·hm-2, while for winter wheat yield were 9 740～10 275 kg·hm-2, and corn yield were 9 630 kg·hm-2～10 211.0 kg·hm-2. Leaf area index of winter wheat were 6.0 and 5.0 at booting and flowering stage, respectively. The photosynthetic potential ranged from 290.2×104·m2·d·hm-2 to 324.3×104·m2·d·hm-2 between turning green and mature stage. The growth stage of summer corn was 111 days, the leaf area index maintained at four from large bell stage to grain filling stage, while that of photosynthetic potential was 233.1×104·m2·d·hm-2～257.5×104·m2·d·
hm-2. the total photosynthetic potential of wheat and corn was 523.3×104·m2·d·hm-2 and 581.8×104·m2·d·hm-2, respectively. Total dry matter was 38 569.1～40 487.0 kg·hm-2. Marginal effect of winter wheat yield was 85.7%～112.9%. 521 pattern of winter wheat was outperform than ‘952 pattern’ because of it increased rows and boundary rows and boundary yield which led to marginal effect. Meanwhile, summer corn was planted at fifteen days after before wheat harvest, therefore extending growth period to nearly 110 days. In conclusion, the ‘521 pattern’ has advantages of marginal compensation and growth period extension over the ‘952 pattern’. |