The effect of biochar and organic resource applications on lettuce cultivation was investigated. Treatment conditions of pot experiment were designed with CN (control), IF (inorganic fertilizer), BC400-1 (Rice husk biochar 400°C 1%), BC400-1+CP (Rice husk biochar 400°C 1%+compost), BC400-4 (Rice husk biochar 400°C 4%), BC400-4+CP (Rice husk biochar 400°C 4%+compost), BC600-1 (Rice husk biochar 600°C 1%), BC600-1+CP (Rice husk biochar 600°C 1%+compost), BC600-4 (Rice husk biochar 600°C 4%) and BC600-4+CP (Rice husk biochar 600°C 4%+compost). The lettuce fresh weight in IF, BC400, and BC600 treatments increased 185, 101-219, and 83-138%, respectively, over that in CN treatment. Total amount of nutrient uptake in lettuce increased in the order BC400-4+CP > IF ≒ BC600-4+CP ≧ BC400-4 ≧ BC400-1+ CP ≧ BC600-1+CP ≧ BC600-4 ≒ BC600-1 ≧ BC400-1 ≒ CN treatments. Considering the results of fresh weight, number of leaves, and nutrients of lettuce, the growth of lettuce was most effective in BC400-4+CP treatment, over that in the IF treatment. Application of combined biochar and compost significantly affected the chemical characteristics of field soil after lettuce harvest. In addition, the positive effects of biochar and compost in soil were related to improved nutrient availability-related parameters such pH and CEC. Therefore, proper application of biochar with compost is effective at improving lettuce cultivation and can benefit the soil environment.
BACKGROUND: Most of the bottom ash(BA) from wood pellet-based thermal power plants that is not recycled is placed into landfill. BA has a function and structure similar to biochar. Hence, BA is classified as waste, but, it is predicted that BA can be used agricultural utilization. METHODS AND RESULTS: To investigate the effect of BA application on lettuce, growth characteristics and Pb contents were examined with BA application levels(0, 1, 2, 3 and 4 g/L), respectively, in hydroponic cultivation with Pb solution. Irrespective with BA application levels, the length, leaf number and fresh weight of lettuce in BA treatments were increased by 84.3~120, 36.2~39.0, and 215~322%, respectively, compared to the BA-0 treatment. The groups with BA treatments, Pb in the nutrient solution was adsorbed to the BA due to the surface area and functional groups of the BA, and the lettuce growth was maintained more smoothly than in the BA-0 treatment. BA application is considered to have created a favorable environment for lettuce growth in hydroponic cultivation with Pb solution. CONCLUSION(S): Although direct comparing the removal effect of heavy metal between BA and biochar is not present, the BA application in contaminated area suggested a significant meaning on the recycling waste, and increasing potential crop productivity by immobilizing heavy metal.
BACKGROUND:The salt in soil interrupts crop growth. Therefore, water resources are used to remove any salt found in the soil. However, water resources have been reduced by global warming; thus, a new study is required into reducing the salt in soil. Recently, the bottom ash (BA) of a biomass power plant was found to be similar to biochar. Hence, it can be used to remove heavy metals and wastewater through the adsorption characteristics of BA. The objective of this study was to evaluate the improvement effects on crop growth in saline soil containing the BA from biomass power plants. METHODS AND RESULTS:The effect on crop growth in the saline soil supplemented with BA was studied with the crop-planted pots, which were packed by reclaimed greenhouse soils collected from Byolyang, Suncheon. The BA application level was 25, 50, 100, 200, and 400 kg/10a (referred as BA25, BA50, BA100, BA200, and BA400, respectively). The BA increased the fresh weights of the leaf and root, while nitrogen uptake increased by approximately 24-102% and 54-77%, respectively for the lead and root. The phosphorous uptake increased by 38%, although only in the leaf of the lettuce. In the case of soil, BA increased water content, pH, EC, CEC, and NH 4 + and the SAR of the soil decreased by 5-15%. The bottom ash increased the contents of Ca 2+ and Mg 2+ , and fixed the amount of Na + . CONCLUSION(S): It was confirmed the bottom ash of a biomass power plant, based on wood pellets, improved crop growth, and increased the nutrient uptake of crops in
BACKGROUND: Liquid fertilizers can provide nutrients to crops effectively and quickly. Amino acid liquid fertilizers produced by decomposing the residues of rendered livestock carcasses are expected to be effective in improving the productivity and quality of crops. METHODS AND RESULTS: The treatment conditions for maize cultivation were control (Cn), inorganic fertilizer (IF), inorganic fertilizer and rendering residue liquid fertilizer (IF+RALF), compost (CP), compost and rendering residue liquid fertilizer (CP+RALF). Crop pro-ductivity, sugar content, and nutrient uptake were investigated after maize harvest in the field applied with liquid fertilizers. Maize yields ranged from 87.6-158 g/plant, and the yield increased by 7.9% and 12.9% in IF+RALF and CP+RALF than in IF and CP, respectively. The maize sugar content increased in the range of 0.1-0.5 brix % by rendering residue liquid fertilizer (RALF) fertilization, and the sugar content was the highest in CP+RALF. There was no significant change in soil chemical properties of the soil due to liquid fertilizer treatment. CONCLUSION(S): RALF increased yield and sugar content in maize cultivation, and fertilization with organic fertilizers was more effective for maize cultivation than inorganic fertilizers. Residues of rendered livestock carcass can be recycled as amino acid fertilizers, which can
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