Synthesis Technics And Effects Of Copper-based Nutritional Protective Powder On Plants

The Copper-based nutritional protective powder,s(CNPP) synthesismaterial molar ratio, synthesis temperature, synthesis agitation time, particlediameter size, acidity and sorts, accession orders, dosages of the additive andtrace nutritional elements were determined primarily by the comparativeexperiments of synthesis indoors,the eligible products were screened out andthe synthesis technics was ascertained by testing the capability technologyindexes of substantive experimental products. The concentration range ofspraying CNPP on capsicum, cucumber and tomato, was ascertained bytoxicity experiments or control effect experiments of CNPP on Phytophthoracapsici, Pseudopero-nospora cubensis. The effectiveness that CNPP couldsterilize the plants, and also supply trace nutritional elements was testedprimarily. The findings provided a theoretic support and technical reference forimproving the processing techniques and exploring the extensive of CNPP.The research results were as follows:1. The synthesis technology for CNPP was that alkali copper sulfate wassynthesized by reacting Ca(OH)2 with CuSO4 at 60-70℃in a 0.7 molar ratio,sufficiently mixed, filtrated and whetted, formulation adjuvants, and organicstate trace nutritional elements (Fe,Zn etc) were then added, and whetted,followed by spray drying at 110±5℃, resulting in finished product with a yieldof >85%.2. The CNPP provided excellent control effect of Diplocarpon mali andPhytophthora capsici, EC50 were 50.65mg L^-1, 48.46mg L^-1, respectively, withcontrol effect approaching that provided by the American product Kocide2000(KCD, 47.22mg L^-1,47.43mg L^-1) and exceeding that by traditional Bordeauxmixture (BDM,72.40mg L^-1,82.96mg L^-1) or by a Chinese package-mixproduct composed of metalaxy plus fosetyl aluminium plus a coppercontainingorganic ring (MCA,64.21mg L-1,65.65mg L-1), the control effect of traditionalBordeaux mixture was the worst. The CNPP provided excellent control effectof capsicum seedling Phytophthora capsici and greenhouse cucumberPseudoperonospora cubensis, the control effect at greenhouse cucumberPseudoperonospora cubensis was 76% at 30 days after spraying CNPP, whichwas better than the control effect of MCA (56%) and BDM (49%), worse thanthe control effect of KCD (93%). Applied to cucumber, tomato and capsicum,the best attenuant multiple of CNPP were from 600 to 1000. 3. The CNPP could have a promotable effect on growth and developmentof plants. Plant heiht, stem diameter, numbers of leaves, leaf area, content ofchlorophyll, growth rate, average yield per plant with CNPP treatment weresignificantly greater than that with other treatments. 4. Within the range of definite spraying concentration (﹤1.667g L-1), theCNPP could supply nutritional elements (Fe, Zn, Ca etc) effectively, andincreased the absorption of Fe, Zn, Ca etc.The Fe content of dry mass ofpotted tomato with CNPP1000 treatment was 570.98mg kg-1, which wassignificantly lower than that with MCA (755.41mg kg-1) and KCD (710.38mgkg-1), and significantly higher than that with BDM (466.90mg kg-1); The Zn,Ca content of dry mass of potted tomato with CNPP1000 treatment were81.93mg kg-1, 42.99g kg-1, respectively, which were higher than that withMCA (76.51mg kg-1, 28.09g kg-1), KCD(70.93mg kg-1,31.99g kg-1) and BDM(70.19mg kg-1, 29.84g kg-1). The effects on potted cucumber, capsicum andtomato were similar. 5. The CNPP had simple processing technology, low cost, idealgermicidal effectiveness, low environmental pollution.The Cu content ofpotted tomato soil with CNPP1000 and CNPP600 treatments were 102.89mgkg-1, 134.45mg kg-1, respectively, which was significantly lower than that withBDM (189.66mg kg-1) and KCD (165.58mg kg-1), but the difference amongCNPP1000, CNPP600 and MCA (104.58mg kg-1) was not significant.