摘要
用连续10次水稻耗竭盆栽试验,探讨了湖北省15种主要类型水稻土不同形态钾占土壤全钾含量的比例。结果是,难风化的白云母和长石类矿物中含钾量平均占90.0%;缓效钾平均占3.34%;有效钾贮量平均占11.1%;交换性钾平均占0.871%。盆栽水稻吸钾量与交换性钾和有效钾贮量呈极显著相关(r=0.7659,0.7695),与缓效钾贮量呈显著相关(r=0.6032)。这也间接证明难风化钾矿物不是钾源的提供者,从有效钾贮量看并不丰富,特别是鄂南地区稻土尤甚。强化钾素在农业内部循环,这才是有效利用土壤钾资源的重要措施。
The padoly soils of fifteen main types in Hubei provinced were investgated by means of 10 succesive exhausted pot cultivations with rice and various forms of K and the potassium-bearing minerals were determined. The results showed that soil potassium existed mainly at the muscovite and feldspar. The content of potassium in these portions averaged 90.0% of soil total potassium, in which 55.2% is in muscovite and 37.8% is in feldspar. The average content of slowly released-K occupied 3.34%, effective stockpil occupied 11.1% and excange-K occupied 0.87% of soil toatl-K.Correlation analysis was performed which showed that the amount of potassium absorbed by rice after 10 successive exhausted pot cultivation was significantly related to the content of slowly released K (R=0.6032) and very significantly related to that of exchange K and effective K (R=0.7659 and 0.7695 respectively). This was also an indirect evidence that potassium-bearing minerals of difficult weathering was not the source of K owing to its low abundance in effective-K, especially true for paddy Soils in the south of Hubei Province. The Significance of potassium in the internal cycle of intensive agriculture was discussed.
出处
《华中农业大学学报》
CAS
CSCD
北大核心
1993年第3期237-244,共8页
Journal of Huazhong Agricultural University
基金
国家自然科学基金
关键词
水稻土
钾
资源
potassium-bearing maneral of difficult weathering
effective-K stockpile
soil potassium resources
