Use of Controlled Release Fertilizer for Increasing N Efficiency of Direct Seeding Rice

摘要

Field trials on a silt-loamy paddy soil derived from shallow-sea deposit in direct seeding rice fields were conducted in Zhejiang, China, in 1996 to compare N efficiency of controlled release fertilizers (LP fertilizers) with the conventional urea. Six treatments including CK (no N fertilizer), conventional urea and different types of LP fertilizers at different rates were designed for two succeeding crops of early and late rice. A blend of different types of LP fertilizers as a single preplant "co-situs" application released N in a rate and amount synchronizing with uptake pattern of direct seeding rice. A single preplant application of the LP fertilizers could meet the N requirement of rice for the whole growth period without need of topdressing. Using LP fertilizer blends, equivalent grain yields could be maintained even if the N fertilization rates were reduced by 25%～50% compared with the conventional urea. Agronomic efficiency of the LP fertilizers was 13.6%～86.4% higher than that of the conventional urea in early rice and 100%～164.1% in late rice, depending on the amounts of the LP fertilizers applied. N fertilizer recovery rate increased from 27.4% for the conventional application of urea to 41.7%～54.1% for the single preplant "co-situs" application of the LP fertilizers. Use of the LP fertilizers was promising if the increase in production costs due to the high LP fertilizer prices could be compensated by increase in yield and N efficiency, reduction in labor costs and improvement in environment.

机译：1996年在中国浙江省的直播稻田中，对浅海沉积物上的粉质壤土水稻田进行了田间试验，比较了控释肥料（LP肥料）和常规尿素的氮素利用率。针对随后的两个早稻和晚稻，设计了六种处理方法，包括CK（无氮肥），常规尿素和不同类型的不同类型的LP肥料。将不同类型的LP肥料掺混在一起作为单一的种植前“异地施用”施用，其释放的N的速率和数量与直接播种水稻的吸收模式同步。种植前只施用LP肥料就可以满足水稻整个生育期的氮素需求，而无需追肥。与常规尿素相比，即使将氮肥施用量降低了25％〜50％，使用LP肥料掺混物仍可保持等效的谷物产量。 LP肥料的农学效率比常规稻的常规尿素高13.6％〜86.4％，而晚稻则高100％〜164.1％，这取决于所施用的LP肥料的量。氮肥的回收率从常规尿素的27.4％提高到LP肥料单种植前“异位”施用的41.7％〜54.1％。如果可以通过增产和提高氮效率，减少劳动力成本和改善环境来弥补由于高LP肥料价格导致的生产成本增加，则使用LP肥料前景广阔。

Use of Controlled Release Fertilizer for Increasing N Efficiency of Direct Seeding Rice

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