AGRO 3503, Unit III-2, Botany of rice, variety selection. Chapters 1, 2, 3, 4, 5 of Univ. Ark. MP 192, Rice Production Handbook.

1. The reproductive stage of rice begins at:

A. 7 leaf growth B. the vegetative lag phase

C. panicle initiation D. anthesis

2. A gibberellic acid seed treatment may help seed emergence for:

A. hybrid varieties B. semi-dwarf varieties

C. water seeded rice D. ‘japonica’ types

3. Tillering in rice usually begins about:

A. 3 leaf stage B. after the vegetative lag phase

C. 5 leaf stage D. at panicle initiation

4. Panicle initiation in rice is sometimes referred to as:

A. the ‘greenring’ stage B. anthesis

C. panicle lag phase D. tillering

5. Flowering of rice usually occurs:

A. at night B. from 6 a.m. – 10 a.m.

C. during the boot stage D. from 9 a.m. – 3 p.m.

6. A sterile, unfilled seed in rice is called a:

A. spikelet B. dud

C. blank D. scratch

7. The two most significant factors affecting rice yields during grain fill are:

A. N and Zn B. light and temperature

C. humidity and temperature D. light and wind

8. The key to high milling yields in rice is:

A. high N fertilization B. uniform maturity at harvest

C. uneven stands at grain fill D. high temperatures during grain fill

9. The two highest yielding short season, long grain rice varieties in Arkansas based

on the 2001 – 2003 season averages were:

A. Kaybonnet and Lemont B. Drew and Cypress

C. Francis and Wells D. Bengal and Francis

10. The only variety showing resistance to kernel smut is:

A. CL 161 B. Francis

C. Cocodrie D. there are none

11. Why is seeding a large percentage of acreage in a single variety NOT recommended?

12. The cooking quality of rice is affected by the:

A. protein content B. amylose content

C. amylopectin content D. starch content

13. The limit on red rice plants for field inspection of Certified seed is:

A. none B. 1 plant per acre

C. 2 plants per acre D. depends on the variety

14. When drilling rice, an adequate stand can be established if seeding at:

A. 10 seeds per square ft B. 20 seeds per square ft

C. 40 seeds per square ft D. 60 seeds per square ft

15. Fungicide seed treatments are recommended for:

A. late planted rice B. early planted rice

C. sandy soils D. water seeded rice

16. Soil preparation in the fall or late winter for spring planting is called:

A. stale seedbed planting B. reduced no-till

C. true no-till D. modified seedbed

17. A potentially severe insect problem in water seeded rice is the:

A. rice stinkbug B. rice root worm

C. rice nematode D. rice water weevil

18. The recommended seeding rate for water seeded rice is:

A. 30% less than drilled B. 30% more than drilled

C. 10% more than drilled D. the same as for drilled

19. If the high and low temperatures yesterday were 90 and 70 F, the DD50 was:

A. 20 B. 30 C. 10 D. 40

20. What are examples of two management decisions the DD50 computer program can

assist growers with?