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Effects Of Controlled Release Compound Fertilizers On Biological Activity And Quality Of Flowers

Posted on:2008-03-05Degree:MasterType:Thesis
Country:ChinaCandidate:Y T SunFull Text:PDF
GTID:2143360215967650Subject:Soil science
Abstract/Summary:PDF Full Text Request
Studies showed that nutrient release of Controlled Release Fertilizers (CRFs) was accordant with plant uptake of nutrients, contributing to enhancing nutrient use efficiency. Controlled Release Fertilizers used in this paper were manufactured in middle demonstrated workshop, located in Shandong Agricultural University, funded by agricultural technology span program sponsored by Ministry of Agriculture. Experiment on nutrient release rate in static water, plug–seedling experiment of Calliopsis and pot experiments of Anthurium and China rose were conducted to study the effects of CRFs on the growth and nutrient uptake of potted flowers, as well as nutrient dynamic changes in soil. In addition, the optimum application amount of CRFs was accordingly determined, which provided the theoretical support and technical reference for the application of CRFs in varieties of flowers, economically and reasonably. Main results were summarized as follows:1. The accumulative nutrient consisting of nitrogen (N), phosphorous (P) and potassium (K) release curve in static water of compound CRFs showed a similar shape of"S"and can be divided into three stages: slow-releasing period, accelerating-release period and declining period. Nutrient release rate steadily increased with time in the first stage and decreased in the third stage. The nutrients released in the second period reached a summit and satisfied the demanding for nutrients of plants for burgeoning and maturing.2. Effects of CRF on growth potential of flowers: Comparing with control and treatments with common compound fertilizer (CCF) and organic manure (OM), the treatments with CRF had significant effects on the growth potential of flowers. The results showed that the CRF not only promoted the synthesis of chlorophyll in Calliopsis, Anthurium and China rose, but also some modal index such as plant height, stem diameter, leaf areas, number of leaves, growth potential, and biomass of plants. Besides, the Anthurium and China rose with CRF treatment possessed boosted florescence, extended view period and increased ornamental value.3. Effects of CRF on some biochemical characters of flowers: Pot experiments of China rose showed that compound CRF significantly increased NRA and root vigor. Compared with control, NRA with CRF treatments was increased by 1.49 to 2.55 times; and root vigor with CRF treatments was increased by 47.3% to 88.9% and 36.1% to117.4% respectively, compared with CCF and OM treatments. MDA content in CRF treatments was decreased significantly.4. Effects of CRF on nutrient content of flowers: Pot experiments of Anthurium showed that content of N and P in leaves reached summit in the blooming stage of flower and increased by 8.9% to19.8% and 50.0% to 64.3%, respectively, compared with CK, and then decreased with the withering of the flowers. By contrast, content of K and Ca in leaves reached summit in blossom period, and was higher than that of control and treatments with CCF. Judging from the dynamic change of Mg content in leaves, Mg with fertilizer treatments and CRF treatments in leaves was higher than that of control and CCF treatments respectively.5. Effects of CRF on nutrient dynamic change in soil: With application of CRF into soil, the release rate of compound CRF can be indicated by the content of NO3--N, NH4+-N,available P and available K. The results showed that the CRF treatments received better results than CCF and OM treatments by increasing both growth potential and content of NO3--N, NH4+-N, available P and available K. Besides, the CRF treatments provided a steady EC and thus a constant nutrient circumstance, promoting the growth of China rose, while pH value fluctuated 0.01 to 0.02 during the whole growth periods.6. The optimum amount of CRF application: Three treatments with CRF were effective and favorable to the growth of Anthurium and China rose, and CRF2 treatment received the best results. Accordingly, the optimum application amounts for Anthurium and China rose in 18 cm×15cm pots was N 1.5g/pot and N1.6g/pot respectively. The results of the plug–seedling experiment of Calliopsis indicated that the excessive amount of CRF could inhibit the growth of plants. In the three CRF treatments, the CRF1 treatment of Calliopsis received best growth condition, and the optimum amount of fertilizer was 35g.
Keywords/Search Tags:Controlled Release Fertilizer, Flowers, Nutrient release, Growth effect, Nutrient dynamic changes
PDF Full Text Request
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