Partial rootzone drying (PRD) is a new irrigation technique which improves the water use efficiency (by up to 50%) of wine grape production without significant crop reduction. The technique was developed on the basis of knowledge of the mechanisms controlling transpiration and requires that approximately half of the root system is always maintained in a dry or drying state while the remainder o...

Background and Aims Water deficit modifies the concentration of aroma compounds grape berries, but little information is available on effect deficits applied at different phenological stages. We evaluated irrigation glycosylated volatile organic (VOCs) responsible for berries Sangiovese Merlot cultivars grafted 1103P or SO4 rootstocks. Methods Results Vines were subjected to either pre- post-ve...

Issue 90 November 2012 Africa’s Energy Outlook Ivan Sandrea ................... 3 Monica Enfield ................. 4 Elias Pungong .................. 7 Chekib Khelil .................... 8 Alex Vines...................... 10 Anne Frühauf ................. 12 Oswald Clint and Rob West ...................... 15 Eduardo Pereira and Elison Karuhanga ............17 Amrita Sen .................... 19...

Ground cover is used in some vineyards to improve soil structure and help manage insect pests; previous studies have shown lower leafhopper (Erythroneura spp.) densities on vines grown with ground cover. We undertook a 2-yr study to determine why ground cover is associated with reduced leafhopper densities. Ground cover consisted of a fall-planted cover crop of purple vetch (Vicia benghalensis)...

During two years, four samples per year were collected in Vietnam from rice bran, cassava residue, brewer's grain, tofu residue, soybean meal, coconut cake, sweet potato vines and water spinach for chemical analysis and assessment of water holding capacity (WHC). The selected feedstuffs represent fibre-rich plant sources and agro-industry co-products commonly used in pig feeding in Vietnam. The...

This study deals with the characteristics of throughfall produced by vine (Vitis vinifera L.) in one of the most common pedoclimatic conditions for grape production: a soil derived from marine sediments under a temperate Mediterranean climate, and located rather close to the seacoast. To distinguish the contribution of the plant from that of the atmospheric deposition, the throughfall was colle...

  This study was conducted to assess the induced-changes in the content of total phenolics and individual phenolic acids, total and individual polyamines and some organic acids in the leaves of two important Iranian grapevine cultivars under different durations of drought stress, and to determine their involvement in grapevine drought tolerance. For this purpose, ‘Yaghuti’ as a drought-toler...

Evolutionary studies of oceanic island endemics are usually focused on lineages that have experienced in situ radiation, while those speciated once the or archipelago but not further diversified (single-species endemics) remain understudied. The Macaronesian archipelagos, Atlantic Ocean, home to significant numbers single-species endemics. genus Hedera L. (12 species) includes three from archip...