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稻秆合理配施尿素植稻的研究
STUDIES ON RICE PLANTATION WITH PROPER COORDINATE FERTILIZATION OF RICE STRAW AND UREA
【摘要】 水稻盆栽试验表明:1.不同量稻秆与等量尿素作基肥混合施用,稻秆有助于尿素氮在土壤中的固定和残留.但减少了尿素氮被水稻的利用和水稻的产量,但混合肥料的C/N比为10~20时,水稻的实粒重与尿素单施的结果没有显著差异.2.稻秆及尿素均不同量混合,但调节C/N比至15作基肥施用,稻秆影响尿素的肥效及水稻的产量反应与尿素施用量有关:低尿素N用量时,尿素氮的肥效受抑制,以致水稻产量下降;高尿素N用量(≥N450mg/kg)时,过量氮负效应的作用会受到削弱而有利于水稻的生长和收获.
【Abstract】 Rice pot experiments showed that 1.added rice straw,basal dressed in differentquantities with equal amount of urea before rice transplantation,would enhanee theurea-N fixed and retained in the soil but lessen its utilization by rice,resulting inthe reduction of rice yield.However,no significant differenee of filled grain productionwas o bserved between the treatments o f urea ap plicatio n,as a single dressing andwhen mixed with rice straw in 10,15 or 20 C/N ratio 2. When urea was applied withrice straw both at different rates and the C/N ratio adjusted to 1 5 wholly,the effectof rice straw on urea fertilizing efficacy and rice yield response was also dependenton the amount Of urea,Added rice straw presented the following influences(1)to inhi-bit the efflciency of N applied in low urea application rate and thus redu-ce riee production,(2)to alleviate the negative effect of exeessive N sup ply andbenefit rice growth and yield response in high urea applications(≥450 mg/kg).
- 【文献出处】 华南农业大学学报 ,JOURNAL OF SOUTH CHINA AGRICULTURAL UNIVERSITY , 编辑部邮箱 ,1996年01期
- 【分类号】S511.106.2
- 【被引频次】3
- 【下载频次】27