Fertilizer Dose Based on Soil Tests
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Fertilizer Dose Based on Soil Tests

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Questions and Answers

What is one of the primary reasons for calculating the fertilizer dose?

  • To reduce the farming costs significantly
  • To eliminate all pests in the field
  • To provide optimum quantity of nutrients to plants (correct)
  • To increase the soil's pH level dramatically

    • What do soil test reports help determine about the nutrients available in the soil?

  • The potential profit from crop yield
  • The classification of nutrients as very low to very high (correct)
  • The type of crops that can be planted
  • The exact market price of the nutrients

    • In the context of soil nutrient analysis, what does a 'medium' classification indicate?

  • Soil salinity greater than 10 dSm-1
  • Soil pH between 3.0 and 5.0
  • Potassium levels between 151-200 Kg/ha (correct)
  • Nitrogen levels between 6-8%

    • Which nutrient classification indicates the highest nutrient availability according to the provided categories?

    <p>Very High</p> Signup and view all the answers

    How is the amount of nitrogen, phosphorus, and potassium in the soil primarily assessed?

    <p>Through soil sample collection and expert analysis</p> Signup and view all the answers

    What can be inferred if a soil report classifies nutrients as 'very low'?

    <p>Nutrient deficiency is likely affecting plant health</p> Signup and view all the answers

    Which nutrient absorption aspect is NOT directly mentioned as a purpose of correct fertilizer dosing?

    <p>To decrease the microbial activity in the soil</p> Signup and view all the answers

    What would categorize soil that has a pH between 5.1 and 6.0?

    <p>Low</p> Signup and view all the answers

    What should be the change in fertilizer quantity if the nutrient level is classified as 'Very Low'?

    <p>Fertilizer quantity should be increased by 50%</p> Signup and view all the answers

    Which of the following crops has the highest recommended dose of fertilizer?

    <p>Sugarcane (Adsali)</p> Signup and view all the answers

    How much should the fertilizer quantity be adjusted if the nutrient level is 'Very High'?

    <p>Decreased by 25%</p> Signup and view all the answers

    For which crop is the recommended dose of fertilizer 40:20:20?

    <p>Soybean</p> Signup and view all the answers

    If the nutrient level is classified as 'Low', what should be done with the fertilizer quantity?

    <p>Increased by 25%</p> Signup and view all the answers

    What is the required quantity of Phosphorus for the onion crop if the recommended dose is 100:50:50?

    <p>50 kg/ha</p> Signup and view all the answers

    What should happen to fertilizer quantity when nutrient levels are 'Moderately High'?

    <p>Kept as it is</p> Signup and view all the answers

    How much urea is required for 1ha of onion crop if the recommended dose of Nitrogen is 100 kg/ha?

    <p>100 kg</p> Signup and view all the answers

    How much urea should Dagdu Patil apply to his field per hectare to achieve the desired nitrogen level?

    <p>325.5 kg</p> Signup and view all the answers

    What is the phosphorus content in 100 kg of SSP fertilizer?

    <p>16 kg</p> Signup and view all the answers

    How much MOP does Dagdu Patil need to apply per hectare after reducing it by 25%?

    <p>62 kg</p> Signup and view all the answers

    What is the first calculated amount of nitrogen (from urea) needed before applying the 50% increase?

    <p>217 kg</p> Signup and view all the answers

    If Mr. Shantanu wants to apply urea, how much of it would he need if nitrogen content in MOP is assessed in a different scenario?

    <p>320 kg</p> Signup and view all the answers

    Which nutrient does Mr. Shantanu's soil have the highest content of?

    <p>Potash</p> Signup and view all the answers

    What is the purpose of increasing the urea application by 50% for Dagdu Patil's field?

    <p>To correct the nitrogen deficiency</p> Signup and view all the answers

    How many kilograms of phosphorus does Dagdu Patil aim to apply through SSP?

    <p>50 kg</p> Signup and view all the answers

    What is the recommended dose of phosphorus for an acre of onion crop?

    <p>30 kg</p> Signup and view all the answers

    How much DAP is required for the onion crop after reducing the recommended dose by 25%?

    <p>49 kg</p> Signup and view all the answers

    What percentage of nitrogen does urea contain?

    <p>46%</p> Signup and view all the answers

    How much nitrogen is provided by 49 kg of DAP?

    <p>30 kg</p> Signup and view all the answers

    How much nitrogen is still required after considering the nitrogen from DAP?

    <p>51 kg</p> Signup and view all the answers

    What is the total amount of nitrogen applied from urea and DAP combined?

    <p>60 kg</p> Signup and view all the answers

    What does the nutrient ratio of DAP signify per 100 kg?

    <p>18 kg Nitrogen and 46 kg Phosphorus</p> Signup and view all the answers

    What is the final dosage of nitrogen that needs to be applied to the onion crop?

    <p>60 kg</p> Signup and view all the answers

    Study Notes

    Determining Fertilizer Dose Based on Soil Test Reports

    • Why Soil Tests are Important:
      • To determine the amount of nutrients available in the soil.
      • To guide farmers on the components required for optimal crop growth.
      • To ensure balanced nutrition for plants to improve growth and yield.
      • To reduce the risk of pest attacks and diseases.
      • To increase the population of beneficial microbes in the soil.

    Classifying Soil Nutrient Levels

    • Categories of Nutrient Abundance:

      • Very low
      • Low
      • Medium
      • Moderately high
      • High
      • Very high

    • Impact of Nutrient Levels on Fertilizer Dose:

      • Very low: Increase fertilizer by 50%.
      • Low: Increase fertilizer by 25%.
      • Medium: Keep fertilizer quantity as is.
      • Moderately high: Keep fertilizer quantity as is.
      • High: Decrease fertilizer by 50%.
      • Very high: Decrease fertilizer by 25%.

    Example 1: Calculating Fertilizer Quantities for Onions

    • Case: Mr. Dagdu Patil's soil test results show nitrogen levels are very low, phosphorus levels are medium, and potassium levels are high. He plans to grow onions.

    • Recommended Fertilizer Dose for Onions: 100 kg nitrogen, 50 kg phosphorus, 50 kg potassium per hectare.

    • Calculations:

      • Urea (Nitrogen):
        • Urea contains 46% nitrogen.
        • To get 100 kg nitrogen, you need 217 kg urea.
        • Since nitrogen levels are very low, increase urea by 50% (108.5 kg).
        • Total urea recommended: 325.5 kg/ha.
      • Single Super Phosphate (SSP) (Phosphorus):
        • SSP contains 16% phosphorus.
        • To get 50 kg phosphorus, you need 312 kg SSP.
        • Since phosphorus levels are moderate, keep the SSP dose at 312 kg/ha.
      • Muriate of Potash (MOP) (Potassium):
        • MOP contains 60% potassium.
        • To get 50 kg potassium, you need 83 kg MOP.
        • Since potassium levels are high, decrease MOP by 25% (21 kg).
        • Total MOP recommended: 62 kg/ha.

    Example 2: Calculating Fertilizer Quantities for Rice

    • Case: Mr. Shantanu's soil test results show nitrogen levels are moderately high, phosphorus levels are high, and potassium levels are low. He plans to grow rice.

    • Recommended Fertilizer Dose for Rice: 150 kg nitrogen, 75 kg phosphorus, 75 kg potassium per hectare (60 kg nitrogen, 30 kg phosphorus, 30 kg potassium per acre)

    • Calculations:

      • Diammonium Phosphate (DAP) (Nitrogen and Phosphorus):
        • DAP contains 18% nitrogen and 46% phosphorus.
        • To get 30 kg phosphorus (recommended for rice), you need 65 kg DAP.
        • Since phosphorus levels are high, decrease DAP by 25% (16 kg).
        • Total DAP recommended: 49 kg/ha.
        • This DAP application also provides 9 kg nitrogen.
      • Urea (Nitrogen):
        • Urea contains 46% nitrogen.
        • To get 60 kg nitrogen (after accounting for the 9 kg nitrogen from DAP), you need 111 kg urea.
        • Since nitrogen levels are moderately high, keep the urea dose at 111 kg/ha.
        • Total urea recommended: 111 kg/ha.

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    Description

    This quiz explores the importance of soil tests in determining the optimal fertilizer dose for crops. It covers nutrient levels and their impact on fertilizer application, guiding farmers to improve crop growth and yield. Participants will learn how to classify soil nutrient levels and adjust fertilizer quantities accordingly.

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