Laboratory Exercise No. 5d
Name: John Remart A. Empron Date Performed:
Lab. Schedule : W(7:00-9:00) Date Submitted: Feb.26, 2016
Fertilizer is needed almost to all crops in order to supply the missing nutrients of the plants. In crop production, fertilizer application is the one of the major aspect for them to achieve maximum yield. Timing of fertilizer application has a significant effect on crop yields. Proper timing of the fertilizer application increases yields, reduces nutrient losses, increases nutrient use efficiency ...view middle of the document...
What are some alternatives to commercial /inorganic fertilizer Discuss the advantages as well as disadvantages over the commercial / inorganic fertilizers
Table 1. Physical properties of different fertilizer materials
NPK (46 - 0 - 0)
NPK (14 - 5 - 20)
NPK (12 - 27 - 0)
NPK (14 - 14 - 14)
NPK (21 - 0 - 0)
Di- calcium phosphate
NPK ( 0 - 28 - 0)
NPK (0 - 0 - 45)
NPK (0 - 15 -0)
NPK (14 - 0 - 40)
NPK (0 - 0- 52)
Fertilizers supplement the soil with macronutrients needed in large amounts: nitrogen, phosphorous and potassium. However, organic and inorganic fertilizers do so via different materials. Organic fertilizers contain only plant- or animal-based materials that are either a byproduct or end product of naturally occurring processes, such as manures, leaves, and compost. Inorganic fertilizer, also referred to as synthetic fertilizer, is manufactured artificially and contains minerals or synthetic chemicals. For example, synthetic nitrogen fertilizers are typically made from petroleum or natural gas. Phosphorus, potassium and other trace elements in inorganic fertilizers are often mined from the earth. Balanced inorganic fertilizers, high in all three macronutrients, commonly include products like ammonium nitrate, ammonium sulfate, potassium chloride (potash), triple superphosphate, and magnesium sulfate (Epsom salts). Organic fertilizers release nutrients only when the soil is warm and moist, which tends to correspond with your plants’ times of greatest need. However, they rely on soil organisms to break down organic matter, so nutrients are released more slowly than they are from inorganic fertilizers. This slow-release method reduces the risk of nutrient leaching, but it takes time to supply nutrients to plants. In contrast, inorganic fertilizers provide this nutrition in plant-ready form immediately. However, the concentration of nutrients increases the risk of burning the plant, and the rapid release of nutrients may leach them deeply into the soil and water table where plants can't access them.
Answer to Questions
1. ) Placement
It refers to the placement of fertilizers in soil at a specific place with or without reference to the position of the seed.
Placement of fertilizers is normally recommended when the quantity of fertilizers to apply is small, development of the root system is poor, soil have a low level of fertility and to apply phosphatic and potassic fertilizer.
The most common methods of placement are as follows:
i) Plough sole placement