Search
Search results for
We found
9 results for you
-
Die invloed van nat grondtoestande op die vrugkwaliteit van appels
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.F. Lourens --- ,Vrugontledings op appels van bome op gedeeltelik versuipte gronde gedurende die vruggroei-periode het hoër Na- en B- en laer N- en Mg-peile getoon as appels van bome op droër gronde. Die vrugte van nat persele was fermer en het hoër... -
The effect of ridging on the soil water status of a waterlogged vineyard soil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.A. Myburgh --- , Republic of South Africa J.H. Moolman --- Department of Soil and Agricultural Water Science, Republic of South AfricaIn a field trial conducted in a vineyard on a low-lying hydromorphic soil, it was established that ridging increased the depth from the soil surface to the water table. Ridging did not lower the level of the water table, but... -
Ridging—a soil preparation practice to improve aeration of vineyard soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.A. Myburgh --- , Republic of South Africa J.H. Moolman --- Department of Soil and Agricultural Water Science, Republic of South AfricaWaterlogged soil conditions during early spring can result in poor grapevine performance. In this study the effect of ridging as a method of soil preparation on the depth to the water table, soil air composition and vine reaction, as indicated... -
Effect of ridging on the temperature regime of a waterlogged vineyard soil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.A. Myburgh --- , Republic of South Africa J.H. Moolman --- Department of Soil and Agricultural Water Science, Republic of South AfricaWaterlogged conditions in hydromorphic soils during spring cause low temperatures which may restrict grapevine performance. Ridging is a soil preparation method that can improve internal drainage in the root zone. Temperature measurements showed that ridging tended to increase temperatures in... -
Variability among barley landraces in response to waterlogging stress in the greenhouse
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Assefa --- Sheno Research Center, Ethiopia M.T. Labuschagne --- Department of Plant Sciences, South AfricaBarley production, in some parts of the Ethiopian central highlands, is constrained by seasonal waterlogging. The aim of this study was to investigate differences in growth, nutrient uptake and concentration under waterlogging stress between landraces varying in tolerance. A three... -
Socio-economic impact of ox skidding project to the surrounding villages of Mount Meru forest plantations, Northern Tanzania
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: W.S. Abeli --- Faculty of Forestry and Nature Conservation, Tanzania J.R. Maximillian --- Faculty of Forestry and Nature Conservation, Tanzania A.E. Kweka --- Faculty of Forestry and Nature Conservation, Tanzania D.T.K. Shemwetta --- Faculty of Forestry and Nature Conservation, TanzaniaThe ox skidding project was initiated with the objective ofusing oxen for transporting logs from the stump sites to the landings. It was supposed to be a participatory research project aimed at integrating scientific knowledge with practical skills and resource... -
The impact of community-based forest management on timber treeregeneration in north-eastern Honduras, with specific reference tobig-leaf mahogany (Swietenia macrophylla)
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: M Kukkonen --- Department of Biological and Environmental Sciences, FinlandReduced-impact logging is used to minimise the negative effects of selective logging. However, it has been suggested that low-impact logging may create too little disturbance for the regeneration of the light-demanding timber tree species, hence compromising forest productivity. This study... -
Assessing the utility of airborne laser scanning derived indicators for tropical forest management
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Vitor Antunes Martins da Costa --- , Brazil Adeliton da Fonseca de Oliveira --- , Brazil Jhonathan Gomes dos Santos --- , Brazil Alex Augusto Abreu Bovo --- , Brazil Danilo Roberti Alves de Almeida --- , Brazil Eric Bastos Gorgens --- , BrazilThe objective of this study was to evaluate four airborne laser scanning derived indicators for monitoring tropical forest stands at different stages of sustainable management practices. The traditional monitoring routines are inefficient and time consuming due to the limitation of... -
Productivity curve models in eucalypt timber forwarding
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Irineu Barros Nunes --- , Brazil Eduardo da Silva Lopes --- , Brazil Millana Bürger Pagnussat --- , Brazil Julio Eduardo Arce --- , BrazilExtraction is the most costly and complicated stage of timber harvest operations. The forwarder’s productive capacity in timber harvesting, from planted forests, is influenced by several operational variables, especially by extraction distance and tree volume. Prior knowledge about the effect...