Deciduous tree

A tree that sheds or loses its leaves during winter.

Disk

An tractor-drawn implement with circular plates arranged at an angle with the soil.
Used to prepare the soil for seeding.

Dormant / dormancy

A biological process in which a plant ceases most growth activities and simply maintains existing tissue.

Dowsing (water witching)

Using a forked stick or wire to locate underground water.

Drill

A farm implement for planting seeds which forms a small furrow, deposits the seed in dribbles, covers the seed, and packs soil over it. It can also deposit fertilizer, lime, or other amendments into the soil, alone or with the seed.

Drip irrigation

A method used to place irrigation water near plants' roots through pipes or tubes. This reduces water evaporation and runoff, but may not be cost effective for all crops.

Dry cow

A cow that is not lactating.

Dry period

A rest period between lactations when a cow is not lactating, normally 60 days in duration.

Dryland farming

Farming on non-irrigated land. Success is based on rainfall, moisture-conserving tillage, and drought-resistant crops.

Dapog rice-nursery

Rice seedlings are raised on well-prepared soil (wet bed) either in field or in nursery boxes, covered under banana leaves or plastics with bamboo pegs.
Dapog seedlings are ready for transplanting in 9-14 days after the seed is sown.
It is labour and time saving method with ease of transport.

Decalcification

Removal of calcium carbonate or calcium ions from the soil profile.

Defoliant:

A chemical that causes the foliage to abscise from a plant.

Desiccant

A chemical that accelerates dehydration of plant tissue, causing drying; it also lowers moisture content of seeds to facilitate seed harvest.

Desuckering

The process of removing suckers.

Diversified cropping

A cropping plan in which no single crop contributes 50 per cent or more towards the total crop production or monetary income (comparable equivalent) annually.

Diversified farm

A farm on which no single product or source of income equals as much as 50 per cent of the total receipt and on such farm the farmer depends on several sources of income.