Increasing nitrogen fertilizer use efficiency has become an environmental and economic demand in order to minimize losses of nitrogen and maximize the output from nitrogen added. The application of organic amendments with N fertilizers could be proposed as an important economic and environmental practice for improving N fertilizer use. A two-year field experiment was carried out using the 15N tracer technique to study the impact of corn straw and woody peat application on uptake and utilization of N fertilizer by maize plant. Three treatments were set up: CK (15N labeled urea alone), CS (15N labeled urea + crushed corn straw) and WP (15N labeled urea+ crushed woody peat). The results showed that, as compared to CK, both straw and peat treatments led to (i) an increase in yield of maize, 15N urea utilization rate, and residual 15N urea remained in soil by 11.20% and 19.47%, 18.62% and 58.99%, 41.77% and 59.45%, respectively, but (ii) a decrease in the total loss rate by 6.21% and 16.83% (p < 0.05), respectively over the two seasons. Moreover, the significantly highest effect was recorded with woody peat application rather than that with corn straw. Our study suggests that corn straw and woody peat can be used as organic fertilizers to increase maize yields, promote nitrogen fertilizer balance sheet, reduce the leaching of N fertilizer into the subsurface soil layer, and facilitate the further absorption and utilization of soil residual nitrogen. Therefore, the application of humified organic material play a crucial role in N utilization efficiency enhancement.
The purpose of this research was to determine the influence of Myristic acid and the source of condensed tannin on corn straw basedcomplete feed on nutrient content and in vitro digestibility. The method which was used in this experiment was randomized block design with four treatments and three replications. The treatment consisted of T0 complete feed (40% corn straw + 60% concentrate), T1 complete feed (40% corn straw + 60% concentrate + myristic acid 30 g/Kg DM), T2 complete feed (40% corn straw + 50% concentrate + calliandra leaf meal 10%/Kg DM and myristic acid 30 g/Kg DM), T3 complete feed (40% corn straw + 45% concentrate + calliandra leaf meal 15%/Kg DM and myristic acid 30 g/Kg DM), T4 (40% corn straw + 40% concentrate + calliandra leaf meal 20%/Kg DM and myristic acid 30 g/Kg DM). Based on the result, it could be concluded that calliandra leaf meal 15%/Kg DM + Myristic acid 30 g/Kg DM on the complete feed (T3) was the best treatment based on nutrient content and increase of dry matter digestibility, but not an effect of organic matter digestibility
The study aimed to determine the effect of adding tannin and myristic acid in complete feed on nutrient content and the Profile of volatile fatty acids (VFA) in vitro. The materials used for this research were corn straw, condensed tannins, myristic acid, coffee waste, rice bran, tapioca byproduct, soybean meal, copra meal, and palm kernel meal. The method was used in this experiment was laboratory experiment with four treatments and three replications. The treatment consisted of T1 complete feed (40% corn straw + 60% concentrate (be based DM)), T2 (complete feed + condensed tannins 3%/kg DM and myristic acid 2%/kg DM), T3 (complete feed + condensed tannins 3%/kg DM and myristic acid 3%/kg DM), and T4 (complete feed + condensed tannins 3%/kg DM and myristic acid 4%/kg DM). Every treatment was repeated three times and analysed statistically using Randomized Block Design (RBD). The adding of 4% myristic acid to the complete feed (T4) gives the best results, it increased nutrition and propionic acid, but decreased acetic acid, butyric acid, total VFA and C2/C3 ratio.