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      2. 不同種植密度和施肥水平下湖北二季晚粳群體物質生產特征及其與產量形成的關系
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        國家重點研發計劃專項(2017YFD0301402)


        Matter production characteristics of two-season late japonica populations with different planting densities and fertilizer levels in Hubei Province and their relationships with yield
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          摘要:

          為建立二季晚粳高產栽培技術,促進湖北省“早秈-晚粳”種植模式的發展,以鄂粳403為材料,在2種大田種植密度(28.3萬和37.6萬穴/hm2)和5個施氮水平(0、165、195、225、255 kg/hm2)下比較了其產量形成的差異,并運用Gompertz方程對群體葉面積指數和地上部生物學產量增長動態及其特征參數進行了模擬。結果表明:二季晚粳產量主要決定于施肥量,而受種植密度的影響較小,說明其群體具有較強的自我調節能力。在適宜施肥水平下,單位面積有效穗數和群體生物學產量顯著提高,進而增加經濟產量。在本試驗條件下,二季晚粳適宜施氮量為225 kg/hm2。群體高效物質生產能力取決于其較高的干物質生產速率和較長的干物質快速積累期,并以快速建立起適宜葉面積指數為基礎。高產群體具有較高的葉面積指數增長速率和較短的葉面積指數快速增長期。依據二次曲線模型提出了二季晚粳各階段適宜的群體葉面積指數和干物質生產量,可為其高產群體的建立提供參考。

          Abstract:

          A randomized complete block (RCB) design field experiment of Ejing 403 with 2 transplanting densities (283 000 and 376 000 hills/hm2) and 5 fertilizer (N) levels (0,165,195,225 and 255 kg/hm2) was conducted to establish the high-yield cultivation techniques of two-season late japonica and promote “early indica-late japonica” plantation pattern in Hubei Province. Rice yield under different treatments was investigated and the dynamics and characteristics of leaf area index(LAI) growth and aboveground dry matter production in different populations were simulated with Gompertz equation. The results showed that the yield was significantly affected by fertilizer level but not by planting density,indicating that the populations of two-season late japonica has strong self-regulation ability. The appropriate nitrogen level for japonica tested was 225 kg/hm2. The effective panicle number and dry matter production per hectare were significantly increased at appropriate fertilizer level and thus promoted the economic yield. The high matter production depended on the higher accumulation speed and longer fast accumulation period,which were based on the rapid establishment of the appropriate LAI in the populations with high yield. The populations with higher yield had higher LAI growth speed but shorter fast growth period. The suitable population LAI and biomass production at different stages were proposed based on the modeling by quadratic equations. It will provide a guideline for establishing high-yield populations of two-season late Japonica.

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        楊羅浩,彭福燕,高俊陽,翁玉林,姚璇,涂軍明,楊特武.不同種植密度和施肥水平下湖北二季晚粳群體物質生產特征及其與產量形成的關系[J].華中農業大學學報,2020,39(5):76-84

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        • 收稿日期:2020-05-06
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        • 在線發布日期: 2020-10-05
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