Shoot Growth and Anthesis in Vitis by Charlotte Pratt and B.G. Coombe vitas-vea In the majority of shoots on a grapevine the number of internodes is fairly constant at anthesis. The number of visible internodes was higher in Vitis vinifera L. (16-19) then in V. labruscana BAILEY (12-14). This synchrony in the rates of development
I’m frequently talking about how technologies greatest impact on agriculture could be in new measurements. New research has uncovered a previously unknown means by which plants are able to regulate how their immune systems respond to pathogens. “A group of small peptides, referred to as RALFs (Rapid Alkalinization Factors), serve to dampen immune signaling — preventing further response once
Healthy soil is rich in organic matter, but scientists have yet to fully understand exactly how that organic matter is formed. Now a team of University of New Hampshire scientists have uncovered evidence that microbial pathways – not plants – are the chief originator of the organic matter found in stable soil carbon pools. https://colsa.unh.edu/nhaes/article/2016/12/soilorganicmatter#.WEV8FqJTAQQ.twitter
Exploring the transfer of recent plant photosynthates to soil microbes: mycorrhizal pathway vs direct root exudationFriday, December 16, 2016
A significant proportion of plant photosynthates is transported below ground shortly after photoassimilation and subsequently released to soil microbes. Both root exudation and transfer to mycorrhizal fungi occur rapidly after photosynthesis, ranging from a few hours in grasses to a few days in trees. Root exudation stimulates microbial decomposition of soil organic matter, which in turn improves nutrient availability along the rhizosphere.
Nonresident plants and root exudates influenced the fungal community by both positively and negatively impacting the relative abundance of individual phylotypes. A net increase in fungal biomass was observed when nonresident root exudates were added to resident plant treatments, suggesting that increases in specific carbon substrates and/or signaling compounds support an increased soil fungal population load. This study establishes
Professor James Kennedy of California State University at Fresno, pointed out that phenolics are essential in wine because of their impact on “the visual, aromatic, and tactile properties of wine.” The color of a red wine and the stability of that color, for instance, is entirely due to how phenolics come together during vinification, in
The positive impact of biostimulants on turf grass is gaining momentum…… Bring Forth the Biostimulants
Mycorrhizae are soil fungi that benefit the soil in many ways. Mycorrhizal plants have improved shoot and root growth, higher tissue concentrations of phosphorus, and improved water relations and drought tolerance. Mycorrhizae literally means “fungus root” and describes a mutualistic association between fungus and plant roots that exists in almost all plants. The plant supports
A clear presentation of nutrients required through the almond growing season.
This article from the University of Michigan addresses how foliar applications can increase yield and plant health.
The first objective of this factsheet is to describe the roles that carbohydrate and some of the main nutrient reserves play in the seasonal growth cycle of grapevines, and to outline the conditions under which the post-harvest recovery is most likely to be needed. The second objective is to discuss how irrigation and fertiliser inputs
In most Australian grape growing regions, temperatures are sufficiently warm for vines to retain a functional canopy for up to four months after harvest. Providing the leaves remain in reasonable condition and the supply of water and nutrients is adequate, continued photosynthesis and root uptake during this period allows vines to store carbohydrate and nutrient
Behind the guidelines are a number of years of research in Riverina vineyards in which NWGIC scientists have worked in collaboration with commercial vineyard operators to understand how water supply, crop load, mineral nutrition, heat and disease management all influence grapevine performance. The common factor behind those influences is their impact on seasonal changes in
Trichoderma species have potential in biocontrol of eutypa dieback; however, little is known about their ability to colonise grapevine wood. The colonisation of vines by Trichoderma harzianum and its effects on colonisation by Eutypa lata were studied. Methods and Results: T. harzianum colonised canes over a total distance (above and below the inoculation point) of