File Name: advantages and disadvantages of inorganic fertilizers .zip
Soil Fertility and Crop Productivity 2. Fertilizer 2. Organic fertilizer 2.
- The Advantages of Organic Fertilizers Over Chemical Fertilizers
- The Advantages of Organic Fertilizers Over Chemical Fertilizers
- The Benefits of Using Organic Fertilizers – Organic Vs Inorganic Fertilizers
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Most nutrients needed by plants are supplied solely by soil. Insufficient supply of any of these nutrients may limit plant growth.
There are many advantages and disadvantages of inorganic fertilizers to consider when deciding how to add nutrients to your garden. Inorganic fertilizers usually only contain select nutrients and are quickly and easily absorbed by plants, which allows you to strategically correct any nutrient imbalances indicated in your soil test results. However, there are also many disadvantages to this option, including some negative effects on soil structure and the environment.
The Advantages of Organic Fertilizers Over Chemical Fertilizers
The following information was supplied regarding data availability:. The raw data are provided in the Supplemental Files. Corn silage is an important feed for intense ruminant production, but the growth of corn relies heavily on the use of chemical fertilizers. Sustainable crop production requires careful management of all nutrient sources available on a farm, particularly in corn-based cropping systems.
Experiments were conducted to determine the appropriate technique of corn-legume intercropping in conjunction with the supplemental use of chemical fertilizers, organic manure, and biofertilizers BFs. Acetylene reduction assays ARAs were also performed on corn and soybean roots. The use of BFs had no significant impact on improving either the yield or quality of forage fertilized with inorganic or organic fertilizer. Lactic acid responded differently to different fertilizer applications and was significantly higher in the fertilized plots than in the unfertilized plots.
There is no simple and easy approach to increase biological nitrogen fixation BNF in grain legumes grown as part of a cropping system under realistic farm field conditions. Overall, evidence recorded from this study proves that, compared with corn monocrops combined with CM and chemical fertilizers, corn-soybean intercrops could increase forage yields and quality, produce higher total protein yields, and reduce the need for protein supplements and chemical fertilizers. Corn forage, with its relatively high-energy content, is well adapted for use within low-cost rations for fattening livestock.
Cereal and legume intercropping is important due to possible beneficial effects, including the improvement of forage quality via the complementary production of two or more crops grown concurrently in the same area Eskandari, a. The yield of forage is an important part of grassland resources and describes the volume of dry matter DM available to livestock.
Consequently, legume-cereal arrangements are considered a management practice for producing both forage quality and quantity Eskandari, b. Corn productivity in tropical low-external input systems is usually limited by low soil fertility because crop uptake leads to a gradual depletion in soil nutrient stocks. Since the use of chemical fertilizers is undesirable, management of the fertility of these soils depends primarily on low-cost processes based on nutrient recycling Figueiredo et al.
The main processes that contribute to this recycling are biological nitrogen fixation BNF and nutrient recycling via organic fertilization. BNF can contribute to corn growth and yield by direct fixation within the corn plants or through the use of legume plants as crops either in rotation or intercropped with corn. BNF is usually considered a long-term sustainable N source for low-external input corn production systems Figueiredo et al.
Being a fast-growing plant that performs C 4 photosynthesis, corn requires a plentiful supply of N, P and K essential elements, which traditionally are obtained via inputs of chemical fertilizers to replenish soil N and P, resulting in high costs and environmental pollution Dai et al.
The harmful effects on the environment due to the heavy use of N fertilizers are becoming more evident. There is a need for sustainable farming in which soil fertility is maintained by the use of inexpensive renewable resources that are readily available on the farm.
Organic fertilizers, including farmyard manure, chicken manure CM , sheep manure, and BFs, may be used for crop production as a substitute for chemical fertilizers Khan et al. Soybean plants are capable of supplying N for their own growth and for intercropped cereals via symbiotic N fixation and hence reduce the need for expensive and environmental-polluting N fertilizers Rochester et al. However, additional studies are needed to fully understand the extent to which the N requirements of soybean grown at potential yield levels can be met by optimizing BNF alone as opposed to supplementing BNF with applied N Salvagiotti et al.
Compared with monocropping systems, intercropping systems greatly contribute to crop production because of the effective use of resources Inal et al. The major factor contributing to declining crop yields is reduced soil fertility caused by continuous cropping without the addition of sufficient mineral fertilizers and manure Ndayisaba, The need to reduce costs of fertilizing crops with renewable forms of energy has revitalized the application of organic fertilizers worldwide.
CM was found to be a viable substitute for chemical fertilizers Khan et al. Integrated uses of fertilizer sources help maintain the fertility status of the soil. However, the integration of modest amounts of inorganic fertilizers with organic materials such as CM, BFs and chemicals offers a strategy to meet smallholder crop nutrient requirements, especially in nutrient-intensive corn-legume intercropping systems.
It seems that silage yield and quality are not reduced by intercropping even when NPK fertilizer application levels are reduced. The rainfall peaks in November The mean monthly minimum and maximum temperatures range from The treatments consisted of ten different organic and inorganic fertilizer levels a list of treatments is presented in Table 1.
The intercrop composition was based on a replacement design. Each experimental unit was composed of eight crop rows, each 10 m in length. Each plot consisted of four rows of corn alternating with four rows of legumes, and the experiments were arranged as a randomized complete block design with four replications.
A silage corn Zea mays cultivar and a local soybean Glycine max cultivar were used in the current study. For each bacterium, a 1 liter solution comprising 8 g of nutrient broth NB and 1 liter of distilled water was prepared in a flask. One to 2 full loops of 1 strain of bacteria were added to the flasks. After the seeds had germinated 1 week , the BF solution was applied to the BF treatments in the field.
For a 5 liter BF solution, 4. All other agronomic practices performed uniformly. Corn and soybean intercrops were harvested concurrently. The fresh weights of the harvested were obtained to determine fresh forage yield. The sampled area was 5 m 2 in the center of each plot for the monocropped corn and intercropping treatments, and the fresh biomass weight was determined in grams per DM per square meter; aboveground plant parts were harvested by cutting the plants 2 cm above the soil surface by hand.
Forage DM yields were calculated from the fresh and dry weights of the respective components listed above. Sample plants from each plot were cut into pieces, which were then mixed mechanically.
Dried subsamples were retained for forage quality assays. All dried samples were ground using a hammer mill to pass through a 1 mm screen and analyzed for their nutritive quality values. NIRS analyses involve exposing a sample 0. Energy in this spectral range is directed onto the sample, and the reflected energy R is measured by the instrument.
Harvested forage material from each plot was cut into pieces with a forage chopper. After 10 weeks, the silos were opened, and representative samples were removed for analysis.
Figure 1 shows the process of the silage fermentation analysis. A pH electrode Mettler-Toledo Ltd. Ammonium-N was measured in corn-soybean silage samples via the colorimetric method described by Solorzano The discovery that the nitrogenase enzyme responsible for N fixation also reduces C 2 H 2 acetylene to C 2 H 4 ethylene Dilworth provided a useful assay for the quantification of the N-fixation process.
N fixation was estimated during vegetative growth R 5 stage of soybean—30 days after planting. Nodulated roots of soybean plants and roots of corn plants were placed in a 1, ml incubation vessel polyvinyl chloride [PVC] wide-mouthed bottle.
After one h of incubation, acetylene production was measured by injecting 1 ml of the headspace gas from each of the syringes into a gas chromatograph Agilent Series Gas Chromatograph, Wilmington, DE, USA equipped with a FID detector. All the procedures were repeated three times. Ethylene produced by the nodules was calculated. The least significant difference LSD was used to compare treatment means at the 0. DM yield is a measure of forage productivity.
The integration of chemical fertilizer with CM increased corn and soybean plant heights to the same level as the heights in response to the inorganic fertilizer alone.
In addition, compared with CM alone 3. The results showed that the CP concentration of the corn-soybean forage was markedly affected by the different fertilizer treatments.
The combination of chemical fertilizer and CM increased the mixed forage CP concentration to the same level as that in response to the chemical fertilizer alone. The integration of chemical fertilizer and CM increased the CP content to the same level as that in response to CM alone. Integration of chemical fertilizer and CM increased the mixed forage CP yield to the same level as that in response to the chemical fertilizer alone. Additionally, the effects of different fertilizer application treatments were not significant for DMD, which ranged from Furthermore, the effects of lone and combined fertilizer treatments were not significant for ADL concentrations; the ADL concentration in the forage material ranged from 3.
Integration of NPK and CM increased mixed silage lactic acid and ammonia-N concentrations to the same levels as those resulting from chemical fertilizer. The combination of chemical fertilizer and CM increased lactic acid and ammonia-N contents to the same levels as those resulting from CM fertilizer.
No significant response of silage lactic acid and ammonia-N contents to BF application combined with chemical fertilizer was observed. No significant response of silage lactic acid and ammonia-N contents to BF application combined with CM was observed. The chemical fertilizers, CM, and BF as well as their combinations did not significantly affect the pH, which ranged from 4.
In addition, the different fertilizer application treatments did not significantly affect the silage DM, which ranged from Furthermore, the lone and combination fertilizer treatments did not significantly affect acetic acid, propionic acid or butyric acid concentrations.
Fertilizer treatments significantly affected the results of the acetylene reduction assays ARAs of the corn and soybean roots. Reducing the level of N in the fertilizer treatments led to significant increases in ARA rates.
The ARA rates in the BF treatment were generally higher than those in the other lone fertilizer treatments. In this experiment, BF application alone or in combination with other fertilizers significantly affected the ARA rates. Short plant height was due to the depletion of nutrients from the control plots over time; hence, plants exhibited stunted growth due to an inadequate supply of nutrients. The relatively taller plant height might be attributed to the gradual release of essential nutrients from the chemical and CM fertilizers as needed by the corn plant.
Increased plant height in response to applications of combined fertilizer is attributed to more availability of N from both urea and manure throughout the growing season. As a cereal crop, corn responded well to exposure of its leaves to light, and its uptake of essential nutrients might be attributed to the synergistic action of fertilizer and organic amendments.
Corn has a determinate growth habit, and yield is determined at the early growth stage. Plant availability of micro- and macronutrients at the vegetative stage is important, and this availability was provided by the faster release of nutrients from inorganic fertilizer than from organic fertilizers.
The findings of this experiment are similar to those of Khan et al. The increased LAI observed in response to applications of organic and inorganic fertilizer combinations resulted in increased CGRs Naing et al. Although the rate of application of inorganic fertilizer was reduced in the combined use, complementation with nutrients from organic manure made possible yields that were comparable to those resulting from inorganic fertilizer applications alone.
Chung et al. CM is also a rich source of nutrients that help improve crop yields; lower yields resulting from CM rather than from chemical fertilizer might be due to the slow release of nutrients. In addition to supplying nutrients, organic manure also improves soil structure.
In the present study, organic manure applications enhanced soil organic matter and soil nutrients, which were released slowly and steadily and were efficiently used during later growth stages of corn.
The optimum yield obtained was partly attributable to the integration of organic and inorganic fertilizers: nutrients were released from chemical fertilizers, and corn was able to use those nutrients for growth, which was supplemented by necessary nutrients released from the decomposition of added organic manure.
The Advantages of Organic Fertilizers Over Chemical Fertilizers
Here are 8 advantages and disadvantages to consider when using organic fertilizers in your program. Organic fertilizer is usually made from plant or animal waste — think manure or compost. They can also be highly processed products with a compost or manure base. Soil Structure. Microbes Thrive. Synthetic fertilizer consists of chemical molecules without carbon.
The Benefits of Using Organic Fertilizers – Organic Vs Inorganic Fertilizers
Fertilizers increase the development of plants. This objective is achieved in two processes, the regular one being addition that supplies nutrients. The second method by which various fertilizers act is to raise the potency of the soil by adjusting its water keeping and aeration. Fertilizers commonly supplied, in varying proportions. Fertilizers are categorized in many ways.
The main advantage that inorganic fertilizers have over organic fertilizers is that they can be used immediately to rescue dying plants. This is because the nutrients present in them are easily absorbed by the plants and unlike the nutrients present in organic fertilizers, do not need to be broken into primary nutrients for absorption by plants. Organic fertilizers effects can get delayed and by that time a plant can die completely. Another advantage that inorganic fertilizers have over organic fertilizers is that they are easily available at most gardening stores and hence, are quite convenient to use.
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The different methods of fertilizer application are as follows:. The main objectives of broadcasting the fertilizers at sowing time are to uniformly distribute the fertilizer over the entire field and to mix it with soil. It is the broadcasting of fertilizers particularly nitrogenous fertilizers in closely sown crops like paddy and wheat, with the objective of supplying nitrogen in readily available form to growing plants. The main disadvantages of application of fertilizers through broadcasting are: i Nutrients cannot be fully utilized by plant roots as they move laterally over long distances.
Inorganic fertilizers are appropriate in this situation because the nutrients needed by the plants are readily available. In comparison, using an organic fertilizer would mean that the plant has to wait until the components of the organic fertilizer have been broken down first into its primary nutrients. By then, the plant could be dead already.
• Leeching happens.
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