Explanation

• Apple is a deciduous fruit tree. 
• It sheds its leaves during autumn as it enters winter dormancy.
• Other examples include pear, peach, and plum trees.

Last verified on 16-10-2026

Explanation

• Nematicide seed treatment: Appropriate nematicides can protect seedlings against certain plant-parasitic nematodes when the product is registered for the crop and target pest.
• Crop rotation: Growing non-host crops can reduce nematode populations in the soil.
• Resistant varieties: Planting resistant soybean varieties is an effective method of managing specific nematode species.

Last verified on 16-10-2026

Explanation

• The total depth of water needed by a crop during its entire growth period.
• It ensures the crop receives enough water for optimal growth from sowing to harvest.
• This total water requirement is called Delta.

Additional information:

• Delta varies depending on crop type, climate, and soil texture.
• It is measured in millimeters or cubic meters per hectare.

Last verified on 24-01-2026

Explanation

• Bar harrow: Used for shallow tillage and can uproot or dislodge weeds, helping to control them in agricultural fields.

Additional information:

• Rotavator: Breaks soil clods and prepares a fine seedbed; it can also incorporate weeds into the soil.
• Plank: Used mainly for levelling soil and pressing it lightly after tillage.
• Disc plough: Used for primary tillage, cutting and turning soil.

Last verified on 16-10-2026

Explanation

• Iron (Fe) is an immobile or poorly mobile nutrient in plants.
• Its deficiency commonly causes interveinal chlorosis (yellowing between the veins) in young leaves.

Additional information:

• Iron is a micronutrient required for chlorophyll formation and several plant enzyme processes.
• Iron deficiency is common in calcareous soils, where high soil pH reduces iron availability.

Last verified on 16-10-2026