Emergence date mediation of rice yield responses to equidistant spacing |
| |
| Affiliation: | 1. College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China;2. Institute of Agricultural Resources and Environment, Jilin Academy of Agriculture Sciences, Changchun 130033, Jilin, China;3. Zhangjiakou Academy of Agriculture Science, Zhangjiakou 075000, Hebei, China;1. College of Agronomy, Northwest A&F University, Yangling 712100, China;2. College of Forestry, Northwest A&F University, Yangling 712100, China;1. College of Agronomy, Key Laboratory of Crop Physio-Ecology and Tillage Science in North-Western Loess Plateau, Ministry of Agriculture, Northwest A&F University, Yangling 712100, Shaanxi, China;2. Institute of Water Saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling 712100, Shaanxi, China;3. College of Economics and Management, Northwest A&F University, Yangling 712100, Shaanxi, China;1. The Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Corps, College of Agronomy, Shihezi University, Shihezi 832000, PR China;2. Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Key Laboratory of Crop Physiology and Ecology, Ministry of Agriculture and Rural Affairs, Beijing 100081, PR China;3. Institute of Crop Sciences, Ningxia Academy of Agricultural and Forestry Sciences, Yinchuan, 750105, Ningxia Hui Autonomous Region, China;1. Engineering Research Center of Plant Growth Regulator, Ministry of Education/College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, P.R.China;2. Experimental Base Service Center of Agricultural Sciences, Jiyang 251400, P.R.China |
| |
| Abstract: | The objectives of this study were to assess the importance and interrelationships of emergence date and equidistant spacing to rice (Oryza sativa L.) plant and crop yields and yield variation. Field experiments were conducted in microplots at Keiser, Arkansas, in 1988 and 1989. The treatments were equidistant spacings of 40, 50, 60, and 80 mm. Emergence dates were recorded for plants in the center of each plot. Individual plant grain yields (YG) were recorded at maturity. Relative emergence times (tR, differences in days) were computed between neighboring plants (tRN and between each plant and the first-emerging plant in the plot (tRC). Both expressions of tR revealed that later-emerging plants yielded less than earlier-emerging plants. The negative effect of later emergence was more pronounced at the closer spacings and for tRC than tRN. Thus, tRC was more meaningful than tRN as expression of emergence time. At close spacings, increased tRC decreased to a few days the length of time over which plants could emerge and still produce grain i.e., only the earlier emerging plants were productive. The results also indicated that more uniform crop maturity might result from increasing plant density. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
