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应用~(15)N示踪技术探讨淹水稻田土施用卡州红萍,变异鱼腥藻和念珠藻作氮肥对水稻生长的有效性和氮利用效率。实验结果表明:施用红萍,鱼腥藻,念珠藻的处理,稻株的氮吸收量分别比对照增加91％,176％,215％,而其干物质量(茎叶和根)则分别增加74％,105％,125％。水稻移栽60天后取样分析表明:分别施红萍,鱼腥藻和念珠藻作氮肥,其氮素释放率分别占所施~(15)N总量的26％,49％和53％,而反硝化作用造成的氮损失率则依次为7％,14％和13％,而残留在土壤中氮素则分别为74％,51％,和47％。在不插秧的处理中,施红萍,鱼腥藻和念珠藻,其氮释放率则分别为30％,43％和54％。历经60天后,由于反硝化作用会造成N_2损失,其量则占N索释放总量的93-96％。
The application of ~ (15) N tracer technology in rice paddy soils flooding paddy soil, the use of Anabaena variabilis and Nostoc sp. As nitrogen fertilizer on rice growth and nitrogen use efficiency. The results showed that the nitrogen uptake of rice plants was increased by 91%, 176% and 215%, respectively, while the dry matter content (stem, leaf and root) increased by 74 %, 105%, 125%. The results of sampling after 60 days of transplanting show that nitrogen application rates of Rhizoma Chuanxiong, Anabaena and Nostoc can both account for 26%, 49% and 53% of the total amount of applied 15 N, respectively. However, denitrification The effect of nitrogen loss rate was 7%, 14% and 13%, while the residual nitrogen in soil was 74%, 51% and 47% respectively. In the non-transplanting, Shihongping, Anabaena and Nostoc belus had nitrogen release rates of 30%, 43% and 54%, respectively. After 60 days, due to denitrification will cause N_2 loss, the amount of N-cable release the total amount of 93-96%.