Responses of Seed Yield Components to the Field Practices for Regulating Seed Yield of Smooth Bromegrass ( Bromus inermis Leyss.)

Chengming Ou, Mingya Wang, Longyu Hou, Yangyang Zhang, Ming Sun, Shoujiang Sun, Shangang Jia and Peisheng Mao
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Chengming Ou: Forage Seed Laboratory, China Agricultural University, Beijing Key Laboratory of Grassland Science, Beijing 100193, China
Mingya Wang: College of Animal Science and Technology, Hebei Agricultural University, Baoding 071000, China
Longyu Hou: State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
Yangyang Zhang: China Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
Ming Sun: Forage Seed Laboratory, China Agricultural University, Beijing Key Laboratory of Grassland Science, Beijing 100193, China
Shoujiang Sun: Forage Seed Laboratory, China Agricultural University, Beijing Key Laboratory of Grassland Science, Beijing 100193, China
Shangang Jia: Forage Seed Laboratory, China Agricultural University, Beijing Key Laboratory of Grassland Science, Beijing 100193, China
Peisheng Mao: Forage Seed Laboratory, China Agricultural University, Beijing Key Laboratory of Grassland Science, Beijing 100193, China

Agriculture, 2021, vol. 11, issue 10, 1-11

Abstract: Agronomic practices improve seed yield by regulating seed yield components, and the relationship between seed yield and seed yield components is still unclear in smooth bromegrass ( Bromus inermis ). To optimize seed production and yield in smooth bromegrass, a five-year field trial was designed with split-split-plot to study the combined effects of row spacing (30, 45, 60, and 75 cm), phosphorus (0, 60, 90, and 120 kg P ha −1 ) and nitrogen (0 and 100 kg N ha −1 ) on seed yield and seed yield components including fertile tillers m −2 (FTs), spikelets per fertile tiller (SFT), florets per spikelet (FS), and seeds per spikelet (SS). The results showed that FTs as a key factor had a positive effect to seed yield with the biggest pathway coefficient, while SS had a negative effect. Meanwhile, an interaction effect between FTs and SS was observed. FS and SS were increased with phosphorus application under the condition of sufficient nitrogen. In addition, sufficient precipitation at the non-growing season resulted in more FTs in the next year in rain-fed regions. Therefore, the optimum seed yield of smooth bromegrass can be obtained with row spacing (45 cm), nitrogen (100 kg N ha −1 ), and phosphorus application (60 kg P ha −1 ).

Keywords: fertilization; row spacing; seed yield; seed yield component; smooth bromegrass (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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