An experiment was conducted to determine the effects of application of various levels of GML （ground magnesium limestone） for sweet corn production on two Ultisols, viz.： Bungor and Rengam series soil. The treatmen...An experiment was conducted to determine the effects of application of various levels of GML （ground magnesium limestone） for sweet corn production on two Ultisols, viz.： Bungor and Rengam series soil. The treatments consisted of six levels of GML 0, 0.5, 1.0,2.0,4.0 and 8.0 Mg·ML·ha^-1 incorporated into the top 15 cm, a control which received no GML and no fertilizer. Two crops of sweet corn were planted with a crop of groundnut in a sequence of corn-groundnut-corn. Results indicated that application of 4.0 Mg·GML·ha^-1 and 2.0 Mg·GML·ha^-1 on Bungor and Rengan series soil respectively gave the highest yields in terms of saleable cob number. Soil analysis showed that application of 4.0 and 2.0 Mg·ha^-1 to Bungor and Rengam series soils respectively reduced Al saturation in both soils to 2.0% and increased soil pH to 5.7 and 4.8, respectively.展开更多
The aim of this study was to evaluate the effect of ground corn cobs(GCC) as a sole fiber source in total mixed ration(TMR) on feed intake, milk yield and milk composition in tropical lactating crossbred Holstein cows...The aim of this study was to evaluate the effect of ground corn cobs(GCC) as a sole fiber source in total mixed ration(TMR) on feed intake, milk yield and milk composition in tropical lactating crossbred Holstein cows. Four multiparous crossbreds Holstein Friesian dairy cows with an initial body weight(BW) of 415.5 ± 26.20 kg were used in a 4 x 4 Latin square design. The dietary treatments of TMR contained a roughage-to-concentrate ratio of 40:60. The roughage source was used at different ratios of GCC to rice straw(RS) at 100:0, 82.5:17.5, 67.5:32.5, and 50:50 for TMR1 to TMR4, respectively. The results revealed significant improvements in intake of dry matter, protein,neutral detergent fiber(NDF)and metabolizable energy(ME) for TMR1 and TMR2(P < 0.05), while the digestibility of nutrients was not altered by the treatments(P > 0.05). Ground corn cobs was used for up to 100% of the total roughage without affecting milk production. Moreover, ruminal pH, temperature, ammonia-nitrogen(NH_3-N) and volatile fatty acid(VFA) concentrations were not impacted by the treatments(P> 0.05). However, milk yield was significantly different among the GCC:RS ratios(P < 0.05) and was the highest in TMR1 and TMR2(13.1 kg/d), while the milk compositions were not changed(P > 0.05). The results imply that using GCC as a whole roughage source significantly improved nutrients intake and milk yield in dairy cows raised in tropical areas.展开更多
<span style="font-family:Verdana;">In this study, the possibility of using corn cobs as an organic aggregate in producing lightweight concrete ha</span><span style="font-family:Verdana;&q...<span style="font-family:Verdana;">In this study, the possibility of using corn cobs as an organic aggregate in producing lightweight concrete ha</span><span style="font-family:Verdana;">s</span><span style="font-family:Verdana;"> been investigated. First, some important physical properties of corn cob have been determined in the laboratory. These properties are as follows: weight to volume ratio (unit weight), water absorption rate and granulometric analysis. Later on, 4 concrete mixtures have been prepared according to </span><span style="font-family:Verdana;">the </span><span style="font-family:Verdana;">workability of concrete and standar</span><span style="font-family:Verdana;">d</span><span style="font-family:;" "=""><span style="font-family:Verdana;">s specified in Turkey. After that, unit weight, heat transmissibility coefficient and 28-day pressure strength of these 4 concrete samples have been determined using machines measuring these properties. The 28-day pressure endurance value has been found between 1.4 - 56.25 kgf/cm</span><sup><span style="font-family:Verdana;">2</span></sup><span style="font-family:Verdana;">,</span></span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">heat transmissibility coefficient ha</span><span style="font-family:Verdana;">s</span><span style="font-family:;" "=""><span style="font-family:Verdana;"> been found between 0.19 - 0.35 Kcal/m<span style="white-space:nowrap;">∙</span></span><span style="font-family:Verdana;">h<span style="white-space:nowrap;">∙</span><span style="white-space:nowrap;">˚</span>C and unit weight of samples have been found between 800 - 1520 kg/m</span><sup><span style="font-family:Verdana;">3</span></sup><span style="font-family:Verdana;">. Lastly</span></span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> these properties of concrete samples have been compared with other lightweight materials being used in </span><span style="font-family:Verdana;">the </span><span style="f展开更多
文摘An experiment was conducted to determine the effects of application of various levels of GML （ground magnesium limestone） for sweet corn production on two Ultisols, viz.： Bungor and Rengam series soil. The treatments consisted of six levels of GML 0, 0.5, 1.0,2.0,4.0 and 8.0 Mg·ML·ha^-1 incorporated into the top 15 cm, a control which received no GML and no fertilizer. Two crops of sweet corn were planted with a crop of groundnut in a sequence of corn-groundnut-corn. Results indicated that application of 4.0 Mg·GML·ha^-1 and 2.0 Mg·GML·ha^-1 on Bungor and Rengan series soil respectively gave the highest yields in terms of saleable cob number. Soil analysis showed that application of 4.0 and 2.0 Mg·ha^-1 to Bungor and Rengam series soils respectively reduced Al saturation in both soils to 2.0% and increased soil pH to 5.7 and 4.8, respectively.
基金the Tropical Feed Resources Research and Development Center (TROFREC), Department of Animal Science, Faculty of Agriculture, Khon Kaen University(KKU), Thailand for providing financial support for the research and the use of the research facilitiessupported by the increase production efficiency and meat quality of native beef and buffalo research group, KKU
文摘The aim of this study was to evaluate the effect of ground corn cobs(GCC) as a sole fiber source in total mixed ration(TMR) on feed intake, milk yield and milk composition in tropical lactating crossbred Holstein cows. Four multiparous crossbreds Holstein Friesian dairy cows with an initial body weight(BW) of 415.5 ± 26.20 kg were used in a 4 x 4 Latin square design. The dietary treatments of TMR contained a roughage-to-concentrate ratio of 40:60. The roughage source was used at different ratios of GCC to rice straw(RS) at 100:0, 82.5:17.5, 67.5:32.5, and 50:50 for TMR1 to TMR4, respectively. The results revealed significant improvements in intake of dry matter, protein,neutral detergent fiber(NDF)and metabolizable energy(ME) for TMR1 and TMR2(P < 0.05), while the digestibility of nutrients was not altered by the treatments(P > 0.05). Ground corn cobs was used for up to 100% of the total roughage without affecting milk production. Moreover, ruminal pH, temperature, ammonia-nitrogen(NH_3-N) and volatile fatty acid(VFA) concentrations were not impacted by the treatments(P> 0.05). However, milk yield was significantly different among the GCC:RS ratios(P < 0.05) and was the highest in TMR1 and TMR2(13.1 kg/d), while the milk compositions were not changed(P > 0.05). The results imply that using GCC as a whole roughage source significantly improved nutrients intake and milk yield in dairy cows raised in tropical areas.
文摘<span style="font-family:Verdana;">In this study, the possibility of using corn cobs as an organic aggregate in producing lightweight concrete ha</span><span style="font-family:Verdana;">s</span><span style="font-family:Verdana;"> been investigated. First, some important physical properties of corn cob have been determined in the laboratory. These properties are as follows: weight to volume ratio (unit weight), water absorption rate and granulometric analysis. Later on, 4 concrete mixtures have been prepared according to </span><span style="font-family:Verdana;">the </span><span style="font-family:Verdana;">workability of concrete and standar</span><span style="font-family:Verdana;">d</span><span style="font-family:;" "=""><span style="font-family:Verdana;">s specified in Turkey. After that, unit weight, heat transmissibility coefficient and 28-day pressure strength of these 4 concrete samples have been determined using machines measuring these properties. The 28-day pressure endurance value has been found between 1.4 - 56.25 kgf/cm</span><sup><span style="font-family:Verdana;">2</span></sup><span style="font-family:Verdana;">,</span></span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">heat transmissibility coefficient ha</span><span style="font-family:Verdana;">s</span><span style="font-family:;" "=""><span style="font-family:Verdana;"> been found between 0.19 - 0.35 Kcal/m<span style="white-space:nowrap;">∙</span></span><span style="font-family:Verdana;">h<span style="white-space:nowrap;">∙</span><span style="white-space:nowrap;">˚</span>C and unit weight of samples have been found between 800 - 1520 kg/m</span><sup><span style="font-family:Verdana;">3</span></sup><span style="font-family:Verdana;">. Lastly</span></span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> these properties of concrete samples have been compared with other lightweight materials being used in </span><span style="font-family:Verdana;">the </span><span style="f
