Supplemental pollination-increasing jojoba (Simmondsia chinensis L. [schneider]) seed yields in the Arid Chaco environment

In general, olive trees are self-compatible, but under some climatic conditions a number of cultivars have demonstrated problems with pollination and fruit set. The Manzanillo cultivar is usually self-pollinating, but under hot conditions its pollen develops slowly, resulting in little or no fertilization. Trials were carried out in two hot, arid ecosystems (Arid Chaco in La Rioja, Argentina and Sonoran Desert in Arizona, USA) to determine if supplemental pollination of a Manzanillo cultivar has the potential to increase yields, and to assess the effectiveness of three different cultivars as sources of pollen. Branches that received supplemental pollination produced 21% more total olives than the control. In Arizona, total olive and shotberry (unpollinated olive) production were significantly different between treatments. Branches that received supplemental pollination produced 98% more olives, and had 58% fewer shotberries than did branches in the control rows. Significantly more olives were produced on branches pollinated with Sevillano and Arbequina pollen, compared with those pollinated with Ascolano pollen and with the control.

Download Full-text

Irrigation Cut-off Date Affects Growth, Frost Damage, and Yield of Jojoba

Journal of the American Society for Horticultural Science ◽

10.21273/jashs.118.6.731 ◽

1993 ◽

Vol 118 (6) ◽

pp. 731-735 ◽

Cited By ~ 7

Author(s):

John M. Nelson ◽

David A. Palzkill ◽

Paul G. Bartels

Keyword(s):

Water Potential ◽

Seed Yield ◽

Seed Weight ◽

Frost Damage ◽

First Year ◽

Simmondsia Chinensis ◽

Flower Bud ◽

The Third ◽

Second Year ◽

Seed Yields

Flower bud injury resulting from freezing temperatures has been a major problem in jojoba [Simmondsia chinensis (Link) C. Schneid.] production. A 3-year field study, which began with 4-year-old plants, evaluated the effect of three irrigation treatments on growth, flower bud survival, seed yield, seed weight, and seed wax concentration of six clones. After 3 years, irrigation cut-off dates of late May (dry treatment) and early September (medium treatment) resulted in reduced plant height and width compared to irrigating through November (wet treatment). Flower bud survival and seed yields were very low in the first year for all treatments. In the second and third years, bud survival for most clones, even at -8C, was greatly improved by withholding water in the fall. In December of the second and third years, plants in the medium and dry plots had lower leaf water potential than those in the wet plot. In the second year, plants in the medium and dry plots had seed yields that were 3.5 times higher and wax yields that were were 2.3 times higher than plants in the wet plot. In the third year, the medium treatment had the highest seed and wax yields. Average seed weight and seed wax concentration were generally highest for plants in the wet plot where seed yields were low. Withholding irrigation from jojoba in the fall appears to improve flower bud survival and seed and wax yields following cold winters.

Download Full-text

Effect of irrigation on jojoba production under arid chaco conditions: II-Seed yields and wax quality

Journal of the American Oil Chemists Society ◽

10.1007/bf02564230 ◽

1993 ◽

Vol 70 (12) ◽

pp. 1225-1228 ◽

Cited By ~ 5

Author(s):

Ricardo Ayerza h

Keyword(s):

Seed Yields ◽

Arid Chaco

Download Full-text

THE SUCCESS OF THE LUCERNE MESSAGE IN MARLBOROUGH

Proceedings of the New Zealand Grassland Association ◽

10.33584/jnzg.1981.42.1553 ◽

1981 ◽

pp. 179-183

Author(s):

A.J. Cresswell

Keyword(s):

North America ◽

Weed Control ◽

Seed Yield ◽

Insect Pest ◽

Fold Increase ◽

Plant Spacing ◽

Insect Pest Control ◽

One Year ◽

Seed Yields ◽

New Cultivars

This paper, as well as being a testimonial to the benefit the writer has received from the Grassland Association, shows how the knowledge of scientists has been used to increase lucerne seed yields by methods of growing resistant cultivars especially for seed production as opposed to growing for hay, silage or grazing. It shows how new cultivars can be multiplied quickly by growing two crops in one year, one in each hemisphere, by using low seeding rates, wide plant spacing and very good weed control. Increased flowering of the crop has been achieved by the use of boron and the choice of time of closing; better pollination has been achieved by the use of more efficient bees - two varieties of which have been imported from North America. Weed and insect pest control and the use of a desiccant at harvest are contributing to a four-fold increase in seed yield, which should double again soon,

Download Full-text