• ISSN 1008-505X
  • CN 11-3996/S

钵盘育秧一次性施氮对水稻秧苗质量、产量提升和稻田氮磷减排的协同效应

Nitrogen completely applied in seedling-growing bowl tray inproves seedling quality and yield of rice and reduces nitrogen and phosphorus discharge through paddy field water

  • 摘要:
    目的 从秧苗质量、水稻产量、稻田田面氮素浓度多个角度,探索了利用钵盘育秧技术减少氮肥用量,并以秧肥替代水稻常规基肥和追肥的可行性,旨在为氮素优化管理、稻田氮磷减排提供技术支撑。
    方法 试验在广西农科院院基地进行,供试水稻品种为‘桂野丰’。设置3个处理:常规机插育秧硬盘育秧+大田常量氮肥(CK);钵盘育秧+全生育期减氮30%,氮肥按秧肥(控释尿素)与蘖肥(尿素) 4﹕6的比例施用(T1);钵盘育秧+全生育期减氮30%,全部氮肥(控释尿素)做秧肥一次性施入(T2)。育秧17 d后,调查秧苗质量及氮、磷、钾含量。在基肥、蘖肥和穗肥期,测定田面水中氮、磷浓度,收获期测定水稻产量及其构成因素,以及稻谷和稻秆的氮、磷、钾含量,并计算氮、磷、钾吸收累积量。
    结果 与CK相比,采用钵盘育秧并结合全生育期减氮30%的处理(T1和T2)显著提升了秧苗的茎基宽、叶片数量、最长根长、根系数量、地上部生物量以及氮含量,同时降低了秧苗地下部的钾含量。其中,T2处理在提升秧苗质量和降低秧苗钾含量方面的作用均大于T1处理。与CK相比,T2处理显著提高了穗长和有效穗数,稻谷产量提高了24.9%,稻秆、稻谷和根系氮含量提高了20.4%、16.0%和31.2%,稻秆、稻谷氮吸收累积量增加了13.5%、44.8%。与T1相比,T2处理稻谷产量提高了18.1%,稻秆、稻谷和根系氮含量提高了11.1%、14.2%和18.0%,稻谷氮吸收累积量增加了34.8%。T1和T2处理的秧苗磷含量以及收获期水稻各部位磷含量及吸收累积量均与CK无显著差异。施用基肥后7 d内,T1和T2处理的田面水全氮和铵态氮浓度显著低于CK;施用蘖肥后5 d内;T2处理的田面水全氮和铵态氮浓度显著低于CK与T1处理。在返青期,T1和T2处理的田面水中全氮、铵态氮、硝态氮和全磷的累积流失量显著低于CK,降幅分别达84.3%~86.8%、93.7%~95.7%、51.5%~57.4%和14.0%~30.2%;在分蘖期,全氮和铵态氮的累积流失量也显著低于CK,降幅为23.2%~68.6%和32.2%~65.9%,并且T2处理的降幅明显高于T1处理。
    结论 利用钵盘育秧技术并配合施用控释尿素,以秧肥替代常规田间施肥方式,在减少30%常规施氮量的条件下,可显著提升秧苗质量,增加水稻穗数,提高稻谷产量和氮吸收量。大田不施氮肥能大幅降低田面水中氮含量,有效实现稻田氮磷减排,因此,是提高水稻生产效益和生态效益的有效措施。

     

    Abstract:
    Objectives This study evaluated the feasibility of substituting conventional field nitrogen (N) fertilization with bowl seedling tray application, examining its impact on seedling quality, rice nutrient uptake, grain yield, and nutrient runoff into paddy surface water. The aim was to inform optimized N management strategies that minimize N and phosphorus (P) losses.
    Methods A field trail was conducted in Guangxi Academy of Agricultural Sciences, with rice cultivar ‘Guiyefeng’ as test materials. Three treatments were applied, CK: conventional seedling-raising and N fertilizer application rate (CK); T1: bowl seedlings, with 30% reduced N applied at a 4﹕6 ratio between nursery and tillering stages using coated urea (180-day release); T2: bowl seedlings, with 30% reduced N (coated urea) applied entirely within the bowls. Seedling quality was assessed 17 days post-transplanting. Surface water samples were collected post-fertilization to measure N and P concentrations. At harvest, grain yield, yield components, and N, P and K accumulation in rice and straw were analyzed.
    Results Both T1 and T2 significantly enhanced stem base width, leaf number, max. root length, root traits, aboveground biomass, and N content compared to CK. T2 outperformed T1 in most metrics, indicating superior seedling vigor. Compared to CK, T2 increased grain yield by 24.9% through increased panicle length and effective panicle number, enhanced N content of rice stalk, grain, and root by 20.4%, 16.0%, 31.2%, thus increased N accumulation rate of rice stalk and grain by 13.5% and 44.8%, respectively. T2 also surpassed T1 in grain yield (18.1%), N content in rice stalk, grain and root (11.1%, 14.2%, 18.0%, respectively), and N accumulation rate in grain (34.8%). T1, T2 and CK exhibited comparable P content in seedlings and P accumulation rate in rice straw and grain. T1 and T2 reduced total N and ammonium in surface water within 7 days after nursery fertilizer (vs. CK), T2 further reduced the total N and ammonium concentrations within 5 days after tiller fertilization (vs. CK and T1). Both T1 and T2 treatments reduced the cumulative loss of total N, ammonium, nitrate and total P in surface water by 84.3%−86.8%, 93.7%−95.7%, 51.5%−57.4% and 14.0%−30.2% in seedling stage, and the cumulative loss of total N and ammonium by 23.2%−68.6% and 32.2%−65.9% in tillering stage, with T2 treatment demonstrating the higher decrease.
    Conclusions Applying 30% reduced N via coated urea entirely within bowl seedling trays effectively enhanced seedling quality, rice yield, and N uptake while minimizing surface water N concentrations throughout the growing season. This approach significantly curtails nutrient runoff, thereby reducing eutrophication risks and promoting sustainable rice cultivation.

     

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