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Study on the Effect of Sea Brine Controlled Release Nitrogenous Fertilizer with Oyster Shells as the

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Tutor: SongWenDong
School: Guangdong Ocean University
Course: Aquatic Products Processing and Storage Engineering
Keywords: oyster shells,sea brine,controlled release nitrogenous fertilizer,coriander,caye
CLC: S145.6
Type: Master's thesis
Year:  2011
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Abstract:
Oyster is a famous economic shellfish with high nutritive value. The resource is abundant and yield is the largest in shellfish. Large quantities of oyster shell are abandoned, which not only pollute the environment, but also waste resources. And oyster shell is of good adsorption capability because of its favealo configuration. Sea brine is abandoned liquor after making salt with seawater, it contains a lot of mineral elements, eliminating brine directly to sea can pollute the environment as well as waste resources. However, at present, the utilizing rate of the two renewable resources is low because of studying on comprehensive utilization of them is scare. In this paper, a kind of controlled release fertilizer with oyster shell and sea brine was made, and described its character and the impacts of fertilizer on sprout complexion, chlorophyll, amino acids and trace elements of coriander and cayenne pepper.In this paper, the main research tasks and results were the following:1.The ingredient of sea brine(1)For sea brine, viscosity degree was 5.2mpa¡¤s, the Baume degree of sea brine was 32.8¡ãB¨¦, pH degree was 6.47, and there was an obvious peak value at at 294nm, absorbed degree 1.047.(2)For sea brine, the content of water was 56.18%. After standing more than half a year, sea brine was delaminated, the superstratum was crystal yellow liquor and as the same as the original sea brine, the middle layer was translucence milk-yellow liquor, the underlayer was white salt after validated. Compared the upper brine with middle, total carbon content was lower, with higher total organic carbon content; total organic carbon content was 67.35% of total carbon in the upper, while total inorganic carbon brine content was 99.88% of total carbon in the middle. Total nitrogen content in the brine was 17.74mg / L with Microwave Digestion - Spectrophotometric determination.(3)Used anion and cation spectra to mensurate common anions and cations from Xuwen sea brine, and the results showed that: The concentrations of anion Cl-, Br-, SO42- were respectively 204.00g / L, 3.56g / L, 74.20g / L, PO43-not detected (concentration less than 0.30g / L), the concentrations of cation Na +, K +, Ca2 +, Mg2 + were respectively 28.50g / L, 19.30g / L, less than 0.50g / L, 83.00g / L. there were 14 microelements with ICP and ICP-MS determination, the highest content of Ca, its content was 36.5 mg / kg, content of Fe, Se, Li was higher, respectively, 14.8 mg/Kg, 8.1 mg/Kg and 4.9mg/Kg, Hg was the lowest with less than 0.001 mg /Kg.(4)Analyse with GC-MS to the organic matters extracted by aether brine and showed that: the organic matters extracted by aether were mainly alkanes, alkenes, alcohols, esters, ketones, ethers and anhydrides substances.In addition, obtain white acicular crystal by freezed sea brine, and make sure it is MgSO4 by deposition and single crystal X-ray diffraction, and obtained rate was 133.18 g/L.2.Make sea brine controlled release nitrogenous fertilizer and describe the character(1)The best technics to make sea brine controlled release nitrogenous fertilizer: Regulated the density of sea brine to 1.1g/mL, then got 200mL sea brine, and solved 20g urea. At this moment, mixed 500g activated oyster shell (activation temperature 750¡æ, activation time 1.5h) and stires enough and then airproofed with preservative film. Adsorbed at the condition of 45¡æ, pH 8.5 in biochemistry incubator, and then making grain, dried at 75¡æ-80¡æ. Now obtained sea brine controlled release fertilizer.(2)Sea brine controlled release nitrogenous fertilizer was of well slow-release: The rate of average daily release was equational, and the release cycle of urge reached about 35d, which completely arrived at the need of controlled release fertilizer.(3)The standard of sea brine controlled release nitrogenous fertilizer was required some quality index as follows: lark grain solid; the concent of N¡Ý100g/Kg; the concent of K¡Ý20g/ Kg; the concent of B¡Ý0.1g/ Kg; the kinds of microelements¡Ý25, which contains Zn¡¢Fe¡¢Mn¡¢Ca¡¢Cu¡¢Ni¡¢Co¡¢Cd et al.; the concent of all microelements¡Ý1.5mg/ Kg; the concent of Pb¡Ü0.2mg/Kg; The release rate of N¡Ý80%; the release cycle of N was 30-40d.(4)Sea brine controlled release fertilizer can keep water well in the soil, and be capable of restraining evaporation of water.3.The effect of sea brine controlled release nitrogenous fertilizer with oyster shells as the carrier on the grown activites of coriander and cayenne pepper Potted coriander and cayenne pepper, was fertilized brine controlled release fertilizer with oyster shells as the carrier to be experimental group, and with ordinary urea fertilizer and no fertilizer for comparison, noted coriander sprout complexion, mensurated chlorophyll¡¢amino acids and microelements.(1)Impact on coriander: the experimental group compared with the two others, made coriander germination time of 1 day ahead and germination rate about 15% increase. there was obvious difference among chlorophyll-a, chlorophyll-b and toll chlorophyll (P©‚0.05), the relationship was: the experimentation> the comparison 1>the comparison 2, and it¡¯s more avail accumulation of chlorophyll-a to be fertilized brine controlled release fertilizer. single amino acids, total amino acids, essential amino acids and flavourous amino acids were visibly different (P©‚0.05) and increased prodigiously; the difference were distinct in measured microelements (P©‚0.05), and microelements increased with respective degree, and Fe increased the maximum growth around 4¡Á10~3¦Ìg/(g¡¤dry weight).(2) Impact on cayenne pepper: the experimental group compared with the two others, made coriander germination time of 1 day ahead but the germination rate was invariability. there was obvious difference among chlorophyll-a, chlorophyll-b and toll chlorophyll (P©‚0.05), the relationship was: the experimentation> the comparison 1>the comparison 2, but it made no difference in the proportion of chlorophyll-a and chlorophyll-b. single amino acids, total amino acids, essential amino acids and flavourous amino acids were visibly different (P©‚0.05) and increased prodigiously. the difference were distinct in measured elements (P©‚0.05), and there was much more incressing in Ca, Na, Cu, Sr, Mn. Fertilizered sea brine controlled release fertilizer made aphid away from cayenne pepper, so as to propect the plants and reduce the pesticide.
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