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Studies on the use of glutamate waste as fertilizer on growing Pak-choi
|關鍵字:||glutamate waste;味素廢液;nitrogen transformation;fertigation;Pak choi;temperature;water content;application rate;soil pH;氮轉化;灌肥;小白菜;溫度;水分含量;施用量;土壤pH||出版社:||土壤環境科學系||摘要:||
The glutamate waste, produced in glutamate processing, contains inorganic salt and organic compound which can be applied as plant nutrition. The purpose of this research was to investigate the change of glutamate waste compounds in the soils and its effect on the growth of Pak-chio. The experiment 1, carried out in incubator, was to study the effects of different application rates of glutamate waste (0%, 0.1%, 0.2%, 1%, 2%, w/w) , temperatures (15℃, 25℃, 35℃) and water contents (15% water contents, 100% F.C., submerged ) on change of nitrogen forms of glutamate waste in soil during 28 days of incubation. The experiment 2 study the effects of application rate of concentrated glutamate waste (0 mg/kg, 100 mg/kg, 200 mg/kg) and water contents (60% F.C., 100% F.C., saturated water contents ) on changes of nitrogen forms of glutamate waste in three different soils at 25℃ during 21 days of incubation. The experiment 3 was to test the effect of glutamate waste on the growth of Pak-chio in a greenhouse. According to the results, suggestions for proper application of glutamate waste for Pak-chio will be made.
Results of two incubation experiments, showing that inorganic nitrogen could have been released quickly at each application rate within three days, but high application rate (1%, 2%) can make very heavy loss of available nitrogen and slow down the nitrification. At 15℃, the microbial activity is low. However, at 25℃ and 35℃, the mineralization and the nitrification rates were relatively higher. When soils were saturated with water or submerged available nitrogen were easy to loss and have a little accumulation of NO3-N. At 15% water content, 60% F.C. and 100% F.C. higher nitrification rates were found because of the higher aeration in the soil. The acidic soil (Pei Kou soil) has lower nitrification. Therefore, increasing pH obviously enhances the nitrification by liming treatment. Meanwhile, high pH soils (Shiow Shui soil and Tie Wei soil), had higher mineralization and nitrification rates.
The pot experiment showed that the glutamate waste promoted Pak-hio growth. Increasing pH of Pei Kou soil, by liming increased yield of Pak-chio and nutrient uptake. The yields on Shiow Shui soil and Tie Wei soil was higher in glutamate waste treatment than the chemical fertilizer treatment; especially the fertigation treatment had highest yield and nutrient uptake. Meanwhile, the residual nutrients were lower in glutamate waste treatment than the chemical fertilizer treatment. By measuring soil pH and the amount of each nutrients and adjusting application rate appropriately, the problem of soil acidification and nutrient accumulation could be avoided.
|Appears in Collections:||土壤環境科學系|
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