摘要
连续4年定位连施试验表明,一年一作春小麦条件下,年施入土粪150 000 kg~225 000 kg/hm2,能显著提高土壤供K量;年连施225 000 kg/ hm2土粪才能使土壤K素收支趋于平衡状态,低于此用量则是亏缺状态;按照目前生产上的正常用量75 000 kg/ hm2连施,土壤速效K减少17.5 %,若土粪用量增至2~3倍可使土壤速效K含量提高47.8 %~107.5 %,但不能保持土壤缓效K含量,4年累积减少20.4 %~25.1 %。可见,仅靠土粪是不能保持土壤K素肥力的,缓效K下降值较大。
According to experiment of consecutive position fertilization with dung for 4 years on soil, it shows that under the condition of harvesting spring wheat one time a year, the quantity of supplying potassic can be increased distinctively by fertilizing 150 000 kg/hm2 to 225 000 kg/hm2 annually. Consecutive applying annually 225 000 kg/hm2 of dung on soil can balance the output and input of soil potassic. If the quantity fertilized smaller than 225 000 kg/hm2, soil potassic is in deficit situation. According to current production, the normal consecutive fertilizing quantity is 75 000 kg/hm2, which leads soil active potassic to decrease 17.5 per cent. If the application rate of dung increases by 2 to 3 times, content of soil active potassic can improve 47.8 to 107.5 per cent, but the quantity of soil slow-release potassic can not be maintained, which reduces accumulatively 20.4 to 25.1 percent within 4 years. See from above, only depending on dung and dirt cannot maintains fertility of soil potassic, furthermore, the decrease in the content of slow potassic is more significant.
出处
《甘肃农业大学学报》
CAS
CSCD
2001年第4期457-460,464,共5页
Journal of Gansu Agricultural University
关键词
土粪
K吸收效率
K库平衡
缓效K
速效K
土壤钾素
dung
potassic aborbtion efficiency
potassic pool balance
slow-release potassic
active potassic