UNITED STATES DEPARTMENT OF AGRICULTURE
BULLETIN No. 844
Contribution from the Bureau of Plant Industry
WM. A. TAYLOR, Chief
Washington, D. C. PROFESSIONAL PAPER August 11, 1920
SWEET-CLOVER SEED
Part I.—Pollination Studies of Seed Production
Part II.—Structure and Chemical Nature of the Seed Coat andits Relation to Impermeable Seeds of Sweet Clover
By
H. S. COE, formerly Assistant Agronomist, Office of Forage-CropInvestigations, and J. N. MARTIN, Professor of Morphologyand Cytology, Iowa State College
CONTENTS
| Page | |
Part I.—Pollination Studies of Seed Production. | |
| Unsatisfactory yields of sweet-clover seed | 1 |
| Previous investigations of the pollination of sweet clover | 2 |
| Outline of pollinating experiments | 3 |
| Structure of the flowers of Melilotus alba | 4 |
| Development of the floral organs of sweet clover | 5 |
| Fertilization in Melilotus alba | 8 |
| Development of the seed | 8 |
| Mature pollen of sweet clover | 9 |
| Germination of the pollen | 9 |
| Cross-pollination and self-pollination of sweet clover | 10 |
| Artificial manipulation of sweet-clover flowers | 10 |
| Seed production of Melilotus alba under ordinary field conditions | 13 |
| Efficiency of certain kinds of insects as pollinators of sweet clover | 14 |
Relation of the position of the flowers on Melilotus alba plants to seed production | 19 |
| Influence of the weather at blossoming time upon seed production | 20 |
| Insect pollinators of sweet clover | ... BU KİTABI OKUMAK İÇİN ÜYE OLUN VEYA GİRİŞ YAPIN!Sitemize Üyelik ÜCRETSİZDİR! |