Agronomy

Question 1

1.Classification due to the hydrological condition in rice field (growing ecology)

Answer 1

i. Upland rice, ii. Lowland rice, iii. Deepwater rice and iv. Floating rice

Question 2

Growing Ecology commonly found in Africa

For rice

Answer 2

i. Upland rice, ii. Hydromorphic, iii. Rainfed /Intensified rainfed lowland and iv. Irrigated lowland

Question 3

Rice Classification by growing period

Answer 3

I.Very early maturing variety – growing period 135 days

Question 4

Stages of growth of Rice

Answer 4

A.VEGETATIVE
•Germination
•Seedlings
•Tillering

B. REPRODUCTIVE STAGE
•Stem enlongation
•Booting

C. Ripening Stage
•Heading
•Milk
•Dough
•Yellow ripe
•Maturity

Question 5

Milk stage

Answer 5

the developing starch grains in the kernel is soft and the interior of the kernel is filled with white liquid resembling milk

Question 6

Soft Dough stage –

Answer 6

the starch in the grain is beginning to become firm but it still soft

Question 7

Hard dough stage –

Answer 7

the whole grain is firm and almost ready for harvest. Moisture content is still above 22 percent

Question 8

Maturity –

Answer 8

The whole grain is hard and ready for harvest. The moisture content at this stage is approximately between 20 to 22 percent

Question 9

Stages of growth of Rice

Answer 9

VEGETATIVE
•Germination
•Seedlings
•Tillering

B. REPRODUCTIVE STAGE
•Stem enlongation
•Booting

C. Ripening Stage
•Heading
•Milk
•Dough
•Yellow ripe
•Maturity
10

Question 10

Botanical Classification of rice

Answer 10

i. Oryza sativa – japonica, indica and javanica (Asian and widely planted in the world),
ii. Oryza glaberrima (being grown in Africa only)