Rice Yield Booster Quiz Quiz

Discover key facts about effective paddy fertilization to help increase rice production and maintain soil health. Perfect for students, beginners, and anyone interested in sustainable agriculture.

1. Best Timing for Nitrogen Application

   When is the optimal time to apply most nitrogen fertilizer to rice paddies for maximum uptake?

   1. Immediately after harvest
   2. Right before field flooding
   3. At the grain filling stage
   4. At the tillering stage

   Explanation: Most nitrogen should be applied at the tillering stage when rice plants are rapidly growing, maximizing uptake for healthy development. Applying immediately after harvest provides no benefit to the next crop, before flooding can lead to loss through leaching, and at grain filling is too late to influence growth significantly.

2. Phosphorus Fertilizer Placement

   Which method is most effective for applying phosphorus fertilizers in paddy fields?

   1. Basal placement before transplanting
   2. Broadcasting after flowering
   3. Surface application after harvest
   4. Foliar spraying during tillering

   Explanation: Basal placement of phosphorus before transplanting ensures it is available in the root zone when young rice plants need it most. Broadcasting after flowering is too late to support early growth, foliar spraying is not efficient for phosphorus, and post-harvest surface application does not benefit current crops.

3. Potassium Deficiency Sign

   What is a typical symptom of potassium deficiency in rice plants?

   1. Purple leaves
   2. Yellowing leaf edges (leaf scorch)
   3. Leaf rolling during midday
   4. Black streaks on stems

   Explanation: Potassium deficiency often causes yellowing and browning at the leaf edges, known as leaf scorch. Purple leaves are a sign of phosphorus deficiency, leaf rolling can indicate water stress, and black streaks are commonly linked to disease, not nutrient issues.

4. Role of Zinc in Paddy Fields

   Why is zinc sometimes added to paddy soils, especially in flooded conditions?

   1. To speed up water drainage
   2. To prevent stunted growth and leaf bronzing
   3. To make soils more acidic
   4. To increase seed size

   Explanation: Zinc is essential for normal growth; its deficiency leads to stunted plants and bronzed leaves, particularly in flooded conditions. It does not influence seed size directly, does not acidify soil, and does not affect drainage rates.

5. Environmentally Friendly Fertilization

   Which practice helps reduce fertilizer loss and environmental impact in paddy farming?

   1. Avoiding organic matter inputs
   2. Applying all fertilizer at once
   3. Using fertilizer during heavy rains
   4. Split application of nitrogen fertilizer

   Explanation: Splitting nitrogen application ensures better plant uptake throughout growth and reduces environmental loss. Applying all fertilizer at once or during heavy rains increases loss, while avoiding organic matter ignores sustainable practices.