Description: Das Projekt "B 3.2: Irrigation and fertigation strategies for water saving and optimum nutrient supply in subtropical fruit orchards utilising stress responses" wird vom Umweltbundesamt gefördert und von Universität Hohenheim, Institut für Kulturpflanzenwissenschaften (340), Fachgebiet Düngung und Bodenstoffhaushalt (340i) durchgeführt. Irrigation and fertigation are main management tools in fruit tree production. Due to the scarcity of water and its susceptibility to contamination with agrochemicals, the objective of subproject B3.2 is to reduce water and fertilizer application without reducing farmers benefits. Results from SFB-phase II indicate, that moderate levels of water and nutrient stress can be used to improve orchard productivity (eustress). (A) Irrigation: Deficit irrigation techniques, namely Partial Rootzone Drying (PRD) and Regulated Deficit Irrigation (RDI) have a big potential for water saving without reducing fruit yield and quality. (B) Fertigation: Zn and B stress effect flower induction, which has to be considered for improved orchard management. (C) Participatory field application: An adapted irrigation control unit was developed and indigenous knowledge on deficit irrigation was identified. In SFB-phase III, drought and nutrient stress phenomena and their interactions will be further investigated to develop innovative Irrigation and Fertigation Strategies (IFS) by a close interaction of on-station and participatory on-farm experiments. One of the objectives is the increase of Water Use Efficiency (WUE) and improvement of fruit quality by applying controlled water and nutrient stress but preventing stress related long-term damage (Topic A). On-station fruit trees will be exposed to spatial and temporal varying water and nutrient supply regimes. Stress response such as sap-flow, xylem pH, stomatal conductance and leaf water potential will be monitored. Optimum combination of stress response signals will be identified using sensor fusion methodology. Threshold values for eustress will be determined and validated in on-farm applications. A coequal objective is the development of a controlled water and fertilizer saving fertigation management system, guaranteeing high yields with less alternating fruit set and an improved fruit quality (Topic B). Fruit trees will be cultured in nutrient solutions with different Zn and B supply and at different temperatures to determine the critical Zn and B nutritional status for flower induction and the underlying phytohormonal regulation. It will be determined during which phenological phases drought stress and nutrient deficiency can be beneficial for flower induction, yield formation and fruit quality. In a participatory approach, IFS-strategies will be applied in on-farm trials at various locations to develop adapted IFS-recommendations jointly with the involved farmers. Telecommunication will be used to disseminate results to practical farming (Topic C).
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Nährmedium ? Obstbau ? Zierpflanze ? Obstbaum ? Obstwiese ? Main ? Düngemittel ? Nährstoff ? Sensor ? Skigebiet ? Umweltqualitätsziel ? Fertigation ? Blüte ? Regulierung ? Fruchtqualität ? Gewährleistung ? Strafrecht ? Stress ? Telekommunikation ? Temperatur ? Dürre ? Wirkung ? Grundwasserdargebot ? Landwirtschaftlicher Betrieb ? Bewässerungssystem ? Laubblatt ? Trocknung ? Leitfähigkeit ? Versorgung ? Wassereinsparung ? Wassernutzung ? Wasserverschmutzung ? Management ? Gewässerqualität ? Wasser ? Wasserknappheit ? Technik ? Bewässerung ? Minderungspotenzial ? Schaden ? Wirkung ? Nährstoffmangel ? Düngung ? Ackerland ? Bildung ? Schwellenwert ? Nährstoffversorgung ? Landwirtschaft ? Verunreinigung ? Strategische Aspekte ? Effizienzsteigerung ? Beteiligung ? Produktion ? Produktivität ? KONTROLLE ? ANGEPASST ? Betriebsvorschrift ? EINHEIMISCHES WISSEN ? EMPFEHLUNG ? ERGEBNIS ? EXPERIMENT ? Haltestelle ? ANGEWANDT ? VERANTWORTUNG ? Kritischer Zustand ? METHODIK ? MISCHUNG ? POTENZIAL ? VERWANDT ? QUALITAETSZIEL ? RETTUNG ? SCHAEDIGUNG ? STANDORT ? VORTEIL ? Verwertung ? WERT ? Wechselwirkung ? AUSGEWAEHLT ? STILLGELEGT ? BEWERTEN ?
Region: Baden-Württemberg
Bounding box: 9° .. 9° x 48.5° .. 48.5°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2006-01-01 - 2009-12-31
Webseite zum Förderprojekt
https://sfb564.uni-hohenheim.de/ (Webseite)Accessed 1 times.