水田和旱地无人机飞播油菜适宜缓释肥用量研究

    Appropriate amount of controlled-release fertilizer for aerial-sown rapeseed at paddy and upland field

    • 摘要: 为明确无人机撒播油菜缓释肥适宜施用量,为飞播油菜增产节本施肥提供依据,该研究设置了水田和旱地大田试验,各设不施肥(CRF0)、常规施肥(CF)和专用缓释肥300、600、900和1200 kg/hm2(CRF300、CRF600、CRF900和CRF1200)6个施肥处理,分析飞播油菜产量构成、氮素吸收和土壤养分对缓释肥用量的响应特征。结果表明:水田飞播油菜产量整体低于旱地,尤其低施肥水平下;水田土壤硝态氮含量较旱地降低84.4%,硝铵比降低93.4%。缓释肥用量增加可大幅提高水田飞播油菜产量,与CF相比:CRF1200显著增产32.4%(P<0.05),单株角果数和收获密度分别显著增加33.7%和70.5%(P<0.05),地上部生物量显著增加45.0%~98.2%(P<0.05),播种-蕾薹期作物生长速率显著提高84.5%~106.8%(P<0.05)。缓释肥900 kg/hm2及以下时单株角果数显著减少27.6%~63.2%(P<0.05),其中CRF300和CRF600各生育期地上部生物量、氮吸收量及作物生长速率均受到显著抑制(P<0.05),CRF900角果至成熟期作物生长速率显著降低54.7%(P<0.05);旱地飞播油菜产量随缓释肥用量增加呈先增后降,CRF900较常规增产24.7%(P<0.05),主要是油菜播种-苗期、角果期-成熟期作物生长速率显著提高25.0%和3.75倍。与CRF900相比,CRF300和CRF600苗期-蕾薹期作物生长速率显著降低74.6%,CRF1200角果期-成熟期作物生长速率显著下降了39.5%(P<0.05)。综上,旱地基施900 kg/hm2缓释肥可有效协调飞播油菜生长前、后期的土壤氮素供应与植株氮素吸收,保证成熟期充足有效的角果数和植株密度。水田缓释肥用量1200 kg/hm2促进飞播油菜冬前氮素和干物质积累,最终提高群体有效角果数而实现增产。

       

      Abstract: To clarify the suitable application rate of controlled-release fertilizer for aerial-sown rapeseed, so to achieve the goal of improving the yield potential and reducing the productive cost for rapeseed production, in this study a field experiment was conducted in paddy and upland area with both six fertilization treatments, which included controlled-release formulated fertilizer quantities of 0, 300, 600, 900 and 1200 kg/hm2 (CRF0, CRF300, CRF600, CRF900 and CRF1200) as well as the use of conventional fertilization (CF). The response of yield formation, nitrogen uptake accumulation and the changes of soil mineral nitrogen concentration for aerial-sown rapeseed during the growth season were investigated as affected by different amount of controlled-release fertilizer application in field experiment. The results were showed as followed: the yield of aerial-sown rapeseed at maturity in paddy field was overall lower than that in upland field, particularly for the low amount of fertilization treatment. The average of nitrate-nitrogen concentration in the soil during the growth season of paddy field was 84.4% lower than that in upland field, and the ratio of nitrate to ammonium was reduced by 93.4% as well. The rapeseed yield in paddy field were significantly improved with the increase amount of controlled-release fertilizer. Compared with CF, CRF1200 significantly increased the yield of aerial-sown rapeseed by 32.4% (P<0.05), the pod number per plant and harvest density of rapeseed at maturity were significantly increased by 33.7% and 70.5% (P<0.05), respectively, the accumulation of aboveground biomass was significantly increased by 45.0%-98.2% (P<0.05), and the crop growth rate from sowing-budding stage were significantly increased by 84.5%-106.8% (P<0.05). Compared to CF, with the quantities of 900 kg/hm2 or less of controlled-release fertilizer, the pod number of rapeseed were all significantly decreased by 27.6%-63.2% (P<0.05), and the accumulation of aboveground biomass, the amount of nitrogen uptake and crop growth rate were all severely inhibited for the treatment of CRF300 and CRF600 (P<0.05), the crop growth rate was decreased significantly by 54.7% from pod to maturity of CRF900 (P<0.05). Whereas with the increase of controlled-release fertilizer, the yield of aerial-sown rapeseed in upland field increased firstly and then decreased. Compared with CF, CRF900 significantly increased the rapeseed yield by 24.7% (P<0.05), mainly due to the remarkable improvement of the crop growth rate from sowing-seedling stage by 25.0% and from pod-maturity stage by 3.75 times, respectively (P<0.05). Compared with CRF900, CRF300 and CRF600 significantly decreased the crop growth rate by 74.6% from seedling to budding stage, the crop growth rate of CRF1200 were significantly lower by 39.5% from pod to maturity (P<0.05). In conclusion, in this research, the yield of aerial-sown rapeseed showed different between paddy field and dry field at the same quantities of fertilization application. The special controlled-release fertilizer of 900 kg/hm2 in upland areas of aerial-sown rapeseed can effectively coordinate the soil nitrogen supply and plant nitrogen uptake during the early and late growth stages of plant, so as to obtain the sufficient and effective number of pods and plant density of rapeseed at maturity. Moreover, in paddy field, the application of 1200 kg/hm2 controlled-release fertilizer can promote the nitrogen and dry matter accumulation of rapeseed before wintering, ultimately increase the effective number of pods and achieve higher yield.

       

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