论文部分内容阅读
本研究运用同位素~(15)N示踪技术,着重研究了水稻秧苗移栽前施肥,秧苗对N素的吸收动态、运转与分配规律以及对N素的利用;同时经过田间试验和实验室糖、氮测定,研究了不同施肥时间、施肥量对秧苗发根和栽后活棵返青的影响及其与体内物质代谢的关系。从而,提出了明确的施肥时间和用量。早稻在移栽前2—3天,每平方米施硫铵18.7—26.2克(3.9—5.5克N/米~2),后季稻在移栽前1—2天,每平方米施硫铵15—22.5克(3.15—4.73克N/米~2);比习惯施肥时间延后2—3天,施肥量每平方米增加5—10克硫铵(1.04—2.08克N/米~2),为水稻秧苗栽前合理施肥提供了科学依据。
In this study, the application of isotope ~ (15) N tracer technology, focused on the rice seedlings before transplanting fertilization, seedlings of N absorption dynamics, transport and distribution rules and the use of N; at the same time, field experiments and laboratory sugar , Nitrogen determination, the effects of different fertilizing time and fertilizer on seedling hair and transplanting greenhouses and their relationship with the material metabolism. Thus, a clear fertilization time and dosage. Early rice 2-3 days before transplanting, ammonium sulfate per square meter 18.7-26.2 grams (3.9-5.5 g N / m ~ 2), after the second rice 1-2 days before transplanting, applying ammonium sulfate per square meter 15-22.5 g (3.15-4.73 g N / m ~ 2), 2-3 days postponed than the conventional fertilization time, and 5-10 g ammonium sulfate (1.04-2.08 g N / m ~ 2) , Which provided a scientific basis for the rational fertilization of rice seedlings before planting.