Cui Hai-Yan, Jin Li-Bin, Li Bo, Dong Shu-Ting, Liu Peng, Zhao Bin, Zhang Ji-Wang
State Key Laboratory of Crop Biology, College of Agronomy, Shandong Agricultural University, Tai'an 271018, Shandong, China.
Ying Yong Sheng Tai Xue Bao. 2013 Nov;24(11):3099-105.
Taking summer maize cultivars Zhenjie 2 (ZJ2), Denghai 605 (DH605), and Zhengdan 958 (ZD958) as test materials, a field trial was conducted to study the effects of shading on the dry matter accumulation and nitrogen (N), phosphorus (P) and potassium (K) absorption of summer maize. Four treatments were installed, i. e., shading from flowering stage to maturity stage (S1), shading from six-leaf stage to flowering stage (S2), shading all through the growth season (S3), and no shading (CK). After shading, the grain yield and dry matter accumulation decreased significantly, and the decrement was related to shading period, showing S3 > S1 > S2. The grain yield in treatments S1, S2, and S3 was averagely 61.6%, 25.3%, and 92.8% lower than that of CK, respectively, indicating that the effects of shading after flowering were greater than those of shading before flowering. The responses of different cultivars to shading presented a similar trend. The nutrient absorption of summer maize before flowering stage showed K > N > P, and the nutrient absorption amount of whole plant showed N>K>P. After shading, the N and P absorption decreased significantly. The plant relative N and P absorption in different treatments had somewhat increase, because the decrement of dry matter accumulation after shading was larger than that of N and P absorption, as compared with the control. After shading, the plant K absorption decreased significantly, and the decrement in S2 was larger than that of dry matter accumulation. Shading before flowering stage had larger effects on the plant K absorption than on the N and P absorption.
以夏玉米品种郑单2号（ZJ2）、登海605（DH605）和郑单958（ZD958）为试验材料，进行田间试验，研究遮光对夏玉米干物质积累及氮（N）、磷（P）、钾（K）吸收的影响。设置了4个处理，即开花期至成熟期遮光（S1）、六叶期至开花期遮光（S2）、全生育期遮光（S3）和不遮光（CK）。遮光后，籽粒产量和干物质积累显著降低，且降幅与遮光时期有关，表现为S3＞S1＞S2。S1、S2和S3处理的籽粒产量分别比CK平均低61.6%、25.3%和92.8%，表明开花后遮光的影响大于开花前遮光。不同品种对遮光的响应呈现相似趋势。夏玉米开花前营养吸收表现为K＞N＞P，全株营养吸收量表现为N＞K＞P。遮光后，N和P吸收显著降低。不同处理植株相对N和P吸收有所增加，因为遮光后干物质积累的降幅大于N和P吸收的降幅，与对照相比。遮光后，植株K吸收显著降低，S2处理的降幅大于干物质积累的降幅。开花前遮光对植株K吸收的影响大于对N和P吸收的影响。
