摘要
采用盆栽试验,研究了控释肥料与水稻专用肥不同施用方式的氮素释放规律及水稻吸收动态。结果表明,控释肥料一次施用处理氮素释放高峰期出现在第8～10d,此后所保持的充足供氮期晚造为40～50d,早造为50～60d。专用肥一次施用处理氮素在1～3d内即达释放高峰,土壤较充足的供氮期仅为30～35d。水稻生长后期控释肥处理供氮水平仍高于专用肥一次施用和分次施用处理。控释肥处理晚造土壤氮素供应水平明显比早造高。控释肥处理的水稻植株在全生育期对氮和磷的吸收速率均较高,对钾的吸收速率前期较高,中后期较低,收获期植株的氮磷钾吸收累积量均高于专用肥处理。两造试验中一次性施用控释肥料均明显提高了肥料氮利用率,较专用肥分次施用和一次施用处理分别提高12.2%～13.5%和20.0%～22.7%,磷钾利用率也有较明显的提高。
Pot experiments were conducted to investigate the effects of controlled release fertilizer (CRF), applyed as only one basal, on nitrogen release and rice absorbing dynamic. It was observed that the maximum N releasing date of the CFR treatment appeared by 8th to 10th day,and the perild of sufficient N supply was maintained for 40-50d for late crops and 50-60d for early crops after peak date.However, the maximum N releasing date of the rice special fertilizer as only one basal treatment occurred at first day to third day, and the date of sufficient N supply was maintained for 30-35d after peak date. In addition, the CRF maintained relatively higher N supply than the special rice fertilizer treatments at late stages. N supplying level the the CRF treatment in the late crops was higher than that in the early crops. In comparison to the special fertilizer either in splits or as one basal, the rate of absorption for N and P the CRF treatment was higher at whole rice growth stage, and the K absorbing rate of the CRF treatment was higher at early growth stage, but lower at medium and late growth stage. The amount of accumulating absorption for N, P and K of the CRF treatment reached maximum in the 3 fertilization treatments at harvest stage. The results also showed that the CRF treatment heightened significantly fertilizer N utilization efficiency, and the N utilization efficiency of CRF was increased by 12.2-13.5% and 20.0-22.7% respectively, comparing to the special rice fertilizer in splits and as basal. Apart from N, and application of the CRF also increased the utilization efficiency of P and K.
出处
《土壤通报》
CAS
CSCD
北大核心
2004年第2期186-190,共5页
Chinese Journal of Soil Science
基金
广东省重大科技专项项目(A20405)
广东省重大科技项目(2001-2-024-01)
科技部农业科技成果转化资金项目(02EFN214400485)资助
关键词
控释肥料
氮素释放
水稻
吸收动态
氮素利用率
生育期
吸收速率
Controlled release fertilizer
A single fertilization
Rice
N release
N absorption
N utilization efficiency
