A型立体栽培架密集摆放对栽培小白菜生长及受光的影响

Effects of Dense Array of A-type Cubic Cultivation Frames on Growth and Light Exposure of Chinese Cabbage

采用A型栽培架进行连续密集摆放,监测了不同摆放方位小白菜的生长情况及其在不同生育期时冠层光照强度的变化。结果表明:采用A型立体栽培架密集摆放方式,对东西方向各列小白菜产量无显著性影响,对南北方向各行小白菜产量的影响主要体现在由南向北第4行的产量显著降低(P<0.05);在生育前期(移栽后第15天)南侧光照强度峰值显著高于北侧(P<0.01),而在生育后期(移栽后第20~30天)南侧光强峰值显著低于北侧(P<0.01);这种生育前期形成的南侧对北侧的光照遮挡,造成了南北侧植株生长的差异,并加重了生育后期南侧对北侧以及上层对下层的光照遮挡。因此,A型架南北方向的密集摆放不宜超过5行;还应考虑在生育中期以后对A型栽培架的中下层植株进行补光,使冠层的光照强度大于30 klx。

By using dense array of A-type cultivation frames,the cultivation substrate was put in long pots to plant the Chinese cabbage.The growth of Chinese cabbage in different directions and the change of canopy light intensity at different growth stages were investigated at different period.The results showed that there was no significant difference among the frame yield at different columns of east-west direction.The yield of Chinese cabbage at the fourth row of south-north direction decreased significantly in the yield(P<0.05).In the early growth period(15 days after transplanting),the peak of light intensity in the south side was significantly higher than that in the north side(P<0.01).In the late growth period(20~30 days after transplanting),the peak of light intensity in the south side was significantly lower than that in the north side(P<0.01).The frames at the northern of the dense array were partly shaded by those at the southern in the early growth period,which resulted in the difference in the growth of plants between the north and the south side.The shading effect including the south to the north and the upper layer to the lower layer at each frame was aggravated at the later growth stage.Therefore,the density of north-south direction was less than 5 lines,and light compensation for the middle and lower layer plants should be taken into account.The light intensity of canopy was more than 30 klx.