控释肥在盆栽棉花上的肥效研究

采用包膜控释肥进行了棉花盆栽试验,并以普通复合肥作对照研究包膜控释肥对棉花的增产效应。研究结果表明,与普通复合肥相比,施用控释肥更有效提高了土壤中硝态氮和铵态氮及其速效磷、速效钾含量,经控释肥处理的棉花叶绿素相对含量、株高均比普通复合肥有明显的优势。控释肥对棉花的果枝数、桃数在各施肥水平上与普通复合肥相比不显著,包膜控释肥施用纯氮量分别在0.2,0.4 g/kg土时比相同施氮量普通复肥具有显著的增产作用,相对增产率分别为113.1%和34.5%,而且在施用量减少的情况下,仍能获得高于普通复肥的产量。控释肥比普通复肥具有控制释放,提高产量和降低施肥量的优越性。

Effects of Controlled Release Compound Fertilizers on Growth of Potted Cotton

The experiment of controlled release compound fertilizers(CRFs) on cotton in pot was studied by comparison the effects of CRFs on cotton with common compound fertilizers(CCFs).The results showed that,compared with the CCF,the CRF significantly increased the contents of NO~-_3-N,NH~ _4-N,available P and available K in the soil.The chlorophyll readings,plant height of the cotton treated by CRFs were greater than that of CCFs.The node,boll,yield of plant with CRFs treatments of any rate was insignificant greater than that of the cotton treated by CCFs.Though the application rate of CRF treatments was less than CCFs treatments in the experiment,the yield of the cotton of the CRFs treatments was still higher than that of CCF treatments.And the rate of increased cotton yield of CRFs was 113.05%,34.54% respectively,compared with pure N CRFs 0.2,0.4 g/kg soil.The CRF showed its advantages of controlling release nutrient,increasing yield and reducing nitrogen application rate.