Q. What is hidden hunger?
The term hiden hunger is used to describe a plant that shows no obvious symptoms yet the nutrient content is sufficient to give the top profitable yield.
The hidden hunger is an expression in soil science to designate a condition in plants brought about through the lack of certain essential elements in the soil and is not easily detected by outward appearance.
Q. What is sure rate?
Sure rate is a rate a little above critical limit to be sure that there is no reduction in yield.
Q. What are the toxicity symptoms of N, P, Fe, Mn, and B?
Toxicity symptoms of N
- Lodging of flowers
- Abortion of flowers
- Susceptible to pest and diseases
Toxicity symptoms of P
- Deficiency of Fe and Zn
Toxicity symptoms of Fe
- Tiny brown spots on lower leaves of rice starting from tips
Toxicity symptoms of Mn
- Stunted plant and tillering is often limited in lowland rice
Toxicity symptoms of B
- Chlorosis of tips of older leaves especially along the margins
Q. What nutrients are the cause of the deficiency symptoms on old leaves?
- Without deadspots: N, P, and Mg
- With deadspots: K and Mo
Q. What nutrients are the cause of the deficiency symptoms on new leaves?
- Interveinal chlorosis: veins remaining green: Fe and Mn
- Veins not remaining green: S and Cu
Q. What nutrients are the cause of the symptoms on terminal buds?
- Ca and B
Q. What nutrients are the cause of the deficiency symptoms on both and new old leaves?
- Zn
Q. What are the 4 major roles of essential plant nutrients?
- Structural components of cell constituents and its metabolically activity
- Maintenance of cellular organisation e.g., turgidity.
- Energy transformation
- Enzyme activity
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