Effects of Nursery Tray and Transplanting Methods on Rice Yield

Agronomy Journal - Tập 110 Số 1 - Trang 104-114 - 2018
Haibing He1, Chao You1, Han Wu1, Dongyue Zhu1,2, Runjun Yang1, Qibao He1, Lan Xu1, Gui Wang1, Lina Wu1
1Anhui Agricultural Univ., College of Agriculture, Hefei, 230036 China
2Anhui Agricultural Univ., School of Engineering, Hefei, 230036 China

Tóm tắt

Core Ideas

The grain yield was highest in the Pot‐S treatment, followed by the Pot‐flat‐S treatment and the Flat‐S treatment.

Insufficient sink size (number of effective panicles multiplied by number of spikelets per panicle) is the key factor in the grain yield reduction in the Flat‐S treatment.

The spatial distribution characteristics of the first and second leaves were crucial for the high yield formation of mechanically transplanted rice.

The objective of this 2‐yr field experiment was to compare the performance of three rice (Oryza sativa L.) cultivars grown in three different nursery trays and mechanically transplanted using compatible machinery. The three treatments were a blanket‐type nursery tray (Flat‐S treatment), a bowl‐type nursery tray (Pot‐S treatment), and a pot‐style/blanket‐type nursery tray (Pot‐flat‐S treatment). The net photosynthetic rate, leaf area index, dry matter accumulation, and matter translocation from the sheath at flowering to the kernel were significantly higher in the Pot‐S treatment than in other two treatments (p < 0.05). The highest grain yield was in the Pot‐S treatment (9.15–11.81 × 103 kg ha–1), followed by the Pot‐flat‐S treatment (8.84–10.62 × 103 kg ha–1), and then the Flat‐S treatment (8.3–9.78 × 103 kg ha–1). Low yields were attributed mainly to weak sink characteristics. The relative heights of the top three leaves on the plant were higher in the Pot‐S treatment than in the other two treatments, and there was more space between adjacent leaves at the top of the canopy in the Pot‐S treatment than in the other two treatments. The flag leaf area, the height difference between the first and third leaves (HDfirst‐third) and between the second and third leaves (HDsecond‐third), the relative height of the first leaf, and the droop angle of the first leaf significantly affected the source and sink traits. Moreover, HDfirst‐second and HDfirst‐third significantly and directly affected grain yield. Thus, the HDs of the top three leaves were crucial for high yields of mechanically transplanted rice.

Từ khóa


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Agronomy Journal

Tập 110 Số 1

104-114

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