Questions

Answer

1

Botanical name

Helianthus annus

2

Family

Compositae / Asteraceae

3

Origin of Sunflower

Mexico

4

Chromosome number

2n = 34

5

Inflorescence of Sunflower is called

Capitulum

6

Sunflower fruit is called

Achene / Cypsela

7

Sunflower plants are

Day neutral, C3, Cross Pollinated, Protandrous

8

Spacing requirement for sunflower

60 x 30 cm (Tall varieties)

45 x 30 cm (Dwarf varieties)

9

Germination type

Epigeal

10

Sunflower is a

Photo-insensitive crop

11

Best suited soil for Sunflower cultivation is

Deep loam soil

12

Oil percent in Sunflower seeds

45 – 50 %

13

Protein content

40 %

14

Linoleic acid content in Sunflower oil

64 %

15

Pungency of Sunflower oil is due to

Oxidation

16

Seed requirement of Sunflower – Dibbling method

5 – 6 kg/ha

17

Seed requirement of Sunflower – Furrow sowing

8 – 10 kg/ha

18

Sowing depth for Sunflower seeds

3 – 4 cm

19

Test weight of Sunflower seeds

55 – 70 g

20

Crop used as a irrigation indicator is

Sunflower

Questions

Answer

21

Critical stages in Sunflower crop

Seedling,

Bud initiation,

Flowering,

Seed development stage

22

Fertilizer requirements of Sunflower

60-80 N: 40-60 K: 40 P kg/ha

23

Important varieties

Surya, Jupiter, Jwalamukhi, JS-1, BSH-1

24

Hand pollination is common in

Sunflower

25

Most commonly used herbicide in Sunflower crop is

Lasso (Alachlor)

26

First hybrid variety of Sunflower

BSH-1

27

Crop used as a Boron deficiency indicator

Sunflower

28

Seed multiplication ratio in Sunflower

1 : 50

29

Plant density 

55,555 plants/ha (Tall varieties)

74,000 plants/ha (Dwarf / hybrid varieties)

30

Sunflower crop is ready for harvest when the moisture content of seed is

20 % 

Sunflower crop insect pest and diseases are posted in Entomology and Pathology Section