Interference of morningglory on photosynthesis, mineral nutrition and growth of sugar cane at initial stage fo development in the plene system

• Grant number: 11/23314-5
• Support Opportunities: Regular Research Grants
• Start date: March 01, 2012
• End date: February 28, 2014
• Field of knowledge: Agronomical Sciences - Agronomy - Crop Science
• Principal Investigator: Silvano Bianco
• Grantee: Silvano Bianco
• Host Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil

Abstract

Weeds are one of the most important biotical factors affecting sugar cane production. Among several weed species, morning-glory is a group of climbing plants very important that infests sugar cane crop. This research project aims to evaluate the effects of interference of Ipomoea nil e Ipomoea hederifolia on photosynthetic process, macronutrient nutrition and growth of sugar cane crop in the PLENE system. This research will be carried out in 90 L capacity amianthus cement boxes filled with clay substrate. Experiments will constitute by three treatment groups: (i) monoculture of sugar cane, (ii) monoculture of morning-glory (Ipomoea nil - first experiment - and Ipomoea hederifolia - second experiment) and (iii) sugar cane in coexistence with morning-glory species. In each treatment group will be set up the treatments constituted by different evaluation times, being 30, 60, 90, 120, 150 and 180 days after sugar cane emergence and morning-glory transplanting. In each evaluation time, crop photosynthetic features will be evaluated: relative content of total chlorophyll, chlorophyll fluorescencve, photosynthetic rate, transpiration rate and stomatal conductance. In addition, in these same times, growth and mineral nutrition characteristics will also evaluated: leaf number, leaf area, dry mass, macronutrient rate and accumulation in crop and weeds. All the data will be submitted to analysis of variance by F test, and means will be compared by Tukey test at 5% of probability, within a factorial scheme(being three treatment groups and six evaluation times for each morning-glory species). (AU)