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Rice Crop Fertilizer Management Quiz

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Questions and Answers

What is the recommended NPK ratio for Aman (kharif) crop fertilizer management?

80:40:40
120:70:70
100:60:60 (correct)
60:30:30

Why should nitrate fertilizers be avoided in paddy fields?

They are more cost-effective.
They promote rapid growth.
They increase soil moisture retention.
They are susceptible to nitrogen loss. (correct)

What is the estimated contribution of biological nitrogen fixation by biofertilizers to rice nitrogen requirements?

15-20%
25-30% (correct)
30-35%
10-15%

What is the first symptom of zinc deficiency that may lead to Khaira disease in rice?

<p>Leaves becoming yellow and drying (C)</p> Signup and view all the answers

How is the management of Khaira disease achieved in rice?

<p>By spraying zinc sulphate at the nursery stage (D)</p> Signup and view all the answers

Flashcards

Fertilizer management in Aman (kharif) rice

The process of applying fertilizer in rice paddy fields, taking into account the specific needs and characteristics of the soil.

Ammonical fertilizer placement in the reduced zone

A method of fertilizer application in rice paddy fields, where fertilizers are placed in the reduced zone of the soil.

Biological Nitrogen Fixation

The process by which certain organisms, mainly bacteria, convert atmospheric nitrogen gas into ammonia.

Khaira disease

A nutrient deficiency in rice, causing yellowing and stunting of the plant, especially in the nursery stage.

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Using biofertilizers for nitrogen in rice

The use of biofertilizers, including algae like Anabaena azollae, to enhance nitrogen availability to rice.