Báo cáo nghiên cứu nông nghiệp " Flowering biology " pot

Flowering biology • Differences between species • Flowering and seed development cycle. • Factors affecting seed production. Eucalyptus nitens seed development cycle June Year 1 Feb Year 2 Nov Year 2 Jan Year 3Feb Year 4Feb Year 5 Objectives of Seed Orchard Management • Early flowering; flowering can begin at 3 years for E. nitens. • Simultaneous flowering between trees; ensures out-crossing. • Promote abundant flowering and abundant seed crops. Seed yields for E. nitens • Some sites produce very little seed. Quoted seed crops are usually less than 100 g per tree. • Crops of 1 kg seed per tree are possible (200,000 seeds). • Site conditions and management important for good seed production. Factors affecting seed production - Eucalypts • Hormone treatments • Nutrition – Fertiliser ( P & K ) • Spacing and topping • Irrigation • Genetics • Environment • Hormone treatments • Nutrition – Fertiliser ( P & K ) • Spacing and topping • Irrigation • Genetics • Environment Factors affecting seed production - Eucalypts Promoting seed production –Spacing • Tree crowns need plenty of light to produce seed. • Shaded branches do not produce seed. • Early thinning needed to keep crown low. • Stocking must be less than 300 stem per ha. Mahogany • Small flowers are borne in axillary or sub-terminal inflorescences. • Flowers are unisexual, with both sexes similar, and the trees monoecious, • Each inflorescence is 10-20 cm in length Mahogany • Pollination is by insects, bees and moths Mahogany • The fruits are large (12-15 x 6-8 cm), woody, erect, capsules, • When dry, the 4 or 5 valved fruits split open from the base, or from the base and the apex simultaneously. • Seeds are chestnut coloured and 7.5- 12 cm in length • There are usually about 35-45 winged seeds per fruit. [...]...Mahogany • Flowering usually takes place when trees are deciduous or just coming into new leaf and shortly before the rainy season • The fruits mature in 10-11 months Teak – flower characteristics • Stamens 6 (5... • Peak receptive period is between mid-morning and early afternoon; after this time the pollen viability gradually decreases Teak – flower characteristics • Teak is insect-pollinated mainly by bees • Flowering season varies ordinarily from June to August or September The fruits ripen from November to January and fall gradually Teak – seed characteristics • Fruits/seeds – for transport and storage it . Orchard Management • Early flowering; flowering can begin at 3 years for E. nitens. • Simultaneous flowering between trees; ensures out-crossing. • Promote abundant flowering and abundant seed. Flowering biology • Differences between species • Flowering and seed development cycle. • Factors affecting seed production. Eucalyptus. coloured and 7.5- 12 cm in length • There are usually about 35-45 winged seeds per fruit. Mahogany • Flowering usually takes place when trees are deciduous or just coming into new leaf and shortly