Zhang Jiwang, Dong Shuting, Wang Kongjun, Hu Changhao, Liu Peng
Key Laboratory of Crop Biology of Shandong Province, College of Agronomy, Shandong Agricultural University, Tai 'an 271018, China.
Ying Yong Sheng Tai Xue Bao. 2006 Apr;17(4):657-62.
Under field condition, this paper studied the effects of shading on the growth, development, and grain yield of summer maize varieties ND108 and YD13. The results showed that shading decreased maize yield significantly, and the effect was differed with different shading period and intensity. With a shading intensity of 50% and 90%, the grain yield of ND108 and YD13 was decreased by 67.5% and 79.4%, and 82.9% and 86.7% when shading at flowering-maturing stage, and by 34.1% and 55.3%, and 47.2%, 65.7% when shading at joining-flowering stage, respectively. Shading at seedling-joining stage had a relatively smaller effect, with the grain yield decreased by 16.9% and 24.5%, and 18.9% and 24.3%, respectively. Shading had a larger effect on YD13 than on ND108, and the effect of shading period was larger than that of shading intensity. Under shading, the growth and development of maize was retarded, and the effect was increased with increasing shading intensity. Shading at joining-flowering stage affected spike differentiation significantly, reflecting in the marked decrease of the numbers of silks and tassels, and the effect was also larger on YD13 than on ND108. The leaf and plant growth was restrained significantly when shading at seedling stage and at flowering-maturing stage.
在田间条件下，本文研究了遮荫对夏玉米品种ND108和YD13生长发育及籽粒产量的影响。结果表明，遮荫显著降低了玉米产量，且不同遮荫时期和强度的影响存在差异。在遮荫强度为50%和90%时，ND108和YD13在开花至成熟期遮荫时，籽粒产量分别降低了67.5%和79.4%，以及82.9%和86.7%；在拔节至开花期遮荫时，籽粒产量分别降低了34.1%和55.3%，以及47.2%和65.7%。在苗期至拔节期遮荫的影响相对较小，籽粒产量分别降低了16.9%和24.5%，以及18.9%和24.3%。遮荫对YD13的影响大于对ND108的影响，且遮荫时期的影响大于遮荫强度。遮荫条件下，玉米的生长发育受到抑制，且随着遮荫强度的增加，抑制作用增强。拔节至开花期遮荫对雌穗分化有显著影响，表现为花丝和雄穗数量显著减少，且对YD13的影响也大于对ND108的影响。在苗期和开花至成熟期遮荫时，叶片和植株生长受到显著抑制。
