Studies Of Applying Effect Of Controlled-Release Fertilizer On Maize

1.Effects of controlled-release fertilizers on yield of maize Studies of applying effects of controlled-release fertilizers (twocontrolled-release nitrogenous fertilizers and many controlled-releasecompound fertilizers) on common maize LD50 and feeding maize KD4showed that CRCFs were better than CRNFs and CK at 2002 in yield, factorsof yield, economy modulus (excepting KD4), LAI and so on. Especially, yieldof CRCFs exhibited best of all. Among KD4: CRFsⅢ,CRFsⅣ,CRFsⅤ,CRFsⅥ increasing production were 10.8%,4.5%,2.2%,15.6%;Among LD50:0.5%,0.3%,8.1%,0.4%. So CRFsⅢ,CRFsⅣ and another CRFs continued doing examinationof fertilizers quantity. That was to say, CRFsA, CRFsB and CRFsC weredivided into three levels each other contrasted with routine fertilizer. Theresults showed the yield of fertilization treats increased by 15.04%～37.67%than blank, and increased by 1.98%～19.02% than CK(but A1/2 and C1).Thereinto, the yields of A2/3,B2/3,C1/2 were highest.2 Effects of controlled-release fertilizers on quality of maize kernel Throughout analyzing the quality of common maize LD50 and feedingmaize KD4, the research showed that the qualities of two maize varieties weredifferent in treatments of fertilizers. In KD4, all indexes of CRFsⅠshowedwell, but others CRFs and CK existed lesser differences. In LD50, analysisintegrating all indexes of qualities showed that CRFsⅢ, CRFsⅣand CRFsⅥwere better than that of CK. The kernel quality of KD4 were far better thanthat of LD50 in EE, Lys, soluble sugar, dissociated AA and so on. But the 5山东农业大学硕士学位论文contents of CF and CA did not obviously show differences. Among theexamination of levels of fertilizers, the results indicated that B2/3, A2/3 andC1/2 were obviously better than CK in the content of soluble sugar,amylopectin/amylose, EE, dissociated AA and Pr, others were near or a bitlower than that of CK. The research said that CRFs could obviously improvethe quality of maize.3 Effects of controlled-release fertilizers on mechanisms of physiology andbiochemistry of forming yield and quality in maize Fertilizers could obviously improve the contents of nitrogen andphosphorus in plant of maize. And the contents were different with the period.The results were that the contents of N and P were higher at prior period in theroutine fertilizer, but at later period the contents in treatments of CRFs werehigher than that of CK. The content of soluble Pr in kernel was different with types of fertilizersand each levels of fertilizers existed difference. The results were that CRFsBcould prominently increase the content of soluble Pr in kernel than that ofCRFsA. Then in CRFsC, the content with lowest level of fertilizer was highest.The activities of SOD, POD and CAT and the content of MDA could not beobviously improved by applying CRFs. But activity of SOD in B2/3, A2/3 andC1/2 was higher than that of CK, other levels of fertilizers were lower thanthat of CK. Applying CRFs could obviously improve the contents of photo-pigments,and CRFsB was best of all, then in CRFsA and CRFsC, the contents in A2/3and C1/2 showed better. As well as CRFs could improve the activity of NRase,also could make the content of heavy metals far lowest than that of GB.4 CRFs influenced characters of physics and chemistry, activities ofenzyme and contents of heavy metals in soil The contents of treatments of CRFs were mostly higher than that ofroutine fertilizers in soil nutrients and soil enzymes. Then CRFs could reducethe contents of heavy metals in soil out and away. The research showed that 6朱红英:控释肥料在玉米上的应用效应研究the content of NO3 -N first fell, then hoisted with the depth of layer of soil. -Especially, the change of CK was most obvious than any of all, and the contentof NO3 -N hoisted rapidly. In 0-20 layer of soil, there were le...