OSR and Crop Fertilisers Flashcards
(18 cards)
What is the typical oil content of oilseed rape?
40%
What is the yield range for winter oilseed rape in Ireland?
3-5.5 t/ha
Which of the following is NOT a major factor affecting OSR yield?
Nitrogen Toxicity
What is von Liebig’s ‘Law of the Minimum’?
Plant growth is limited by the nutrient in least supply
What are the three primary macronutrients in plant nutrition?
Nitrogen, Phosphorus, Potassium
Which macronutrient is essential for vegetative growth and a dark green color in plants?
Nitrogen
What is a primary deficiency symptom of nitrogen deficiency?
Yellowing of lower leaves (Chlorosis)
What is a key role of phosphorus in plant growth?
Root development
Which nutrient deficiency can cause purple or brown foliage?
Phosphorus
What is the main function of potassium in plants?
Enzyme activation and water balance
What happens if there is an excess of potassium in soil?
Magnesium deficiency
Why is sulfur considered the ‘fourth macronutrient’?
It is essential for protein synthesis
Which crops require significant amounts of sulfur for flavor production?
Mustard, onions, and garlic
Which secondary nutrient is critical for cell wall strength and plant integrity?
Calcium
What deficiency causes deformation of new leaves and bud death?
Calcium deficiency
What is the role of magnesium in plants?
Essential for chlorophyll production
What is the main role of boron in plant health?
Cell wall formation
Why is gypsum applied to soil?
To improve calcium availability without altering pH
