Affiliation:
1. Agronomy College, Jilin Agricultural University, Changchun 130118, China
2. Key Laboratory of Germplasm Innovation and Physiological Ecology of Grain Crops in Cold Region, Ministry of Education, Harbin 150030, China
Abstract
Direct-seeded rice has been widely adopted in Asia in recent years. However, its low and unstable yields severely limit the increase in rice production and directly affect food security. The aim of this research was to investigate the effects of different concentrations of paclobutrazol seed soaking on the biomass production and yield formation of direct-seeded rice and to find the optimal concentrations to provide a theoretical basis for the high-yielding cultivation of direct-seeded rice. Two rice varieties, Jiyujing and Jijing305, were used in this experiment, and the seeds were soaked in paclobutrazol at concentrations of 0, 50, 100, 150, and 200 mg L−1. The appropriate concentration of paclobutrazol seed soaking increased the yield of direct-seeded rice; this was attributed to the increase in the spikelet per unit area and the seed setting rate. However, the too-high paclobutrazol concentration was not conducive to a yield increase. Regression analysis showed that the appropriate concentration of paclobutrazol seed soaking was 100–105 mg L−1. The appropriate concentration of paclobutrazol for seed soaking ensured the seedling emergence rate; improved the seedling quality, stem tillers, and productive tillers; increased the efficient leaf area, chlorophyll content, and net photosynthetic rate, resulting in an increase in dry matter accumulation; coordinated the source-sink relationship and dry matter distribution; and promoted the material translocation from the “source” to the “sink”. In conclusion, using the appropriate concentration of paclobutrazol for seed soaking is an effective means of obtaining high yields of direct-seeded rice.
Funder
National Key Research and Development Project of China
Science and Technology Development Plan Project of Jilin Province, China
Open Project of the Key Laboratory of Germplasm Innovation and Physiological Ecology of Coldland Grain Crops, Ministry of Education
Subject
Agronomy and Crop Science
Reference50 articles.
1. Rice yields and water use under alternate wetting and drying irrigation: A meta-analysis;Carrijo;Field Crop. Res.,2017
2. Rao, M.S., Umamaheswari, R., Priti, K., Rajinikanth, R., Grace, G.N., Kamalnath, M., Prabu, P., Kumar, R.M., and Chaya, M.K. (2016). Vidyashree Role of Biopesticides in the Management of Nematodes and Associated Diseases in Horticultural Crops. Plant Soil Microbes, 117–148.
3. Progress in ideotype breeding to increase rice yield potential;Peng;Field Crop. Res.,2008
4. Dry direct-seeded rice as an alternative to transplanted-flooded rice in Central China;Liu;Agron. Sustain. Dev.,2014
5. The patterns of spread and economics of a labor-saving innovation in rice production: The case of direct seeding in Northeast Thailand;Pandey;Q. J. Int. Agric.,2012