Search results for "Forestry"

Sampling procedure in a willow plantation for estimation of moisture content

2015

Abstract Heating value and fuel quality of wood is closely connected to moisture content. In this work the variation of moisture content (MC) of short rotation coppice (SRC) willow shoots is described for five clones during one harvesting season. Subsequently an appropriate sampling procedure minimising labour costs and sampling uncertainty is proposed, where the MC of a single stem section with the length of 10–50 cm corresponds to the mean shoot moisture content (MSMC) with a bias of maximum 11 g kg −1 . This bias can be reduced by selecting the stem section according to the particular clone. The average difference in MSMC between the largest and smallest shoot in a stump was 31 g kg −1 .…

Unnamed Soils, Lost Opportunities.

2019

Have you ever read a scientific article about brown bear referred to as “an animal with long, thick brown fur and a shoulder height up to 150 cm” instead of using its scientific name, Ursus arctos? Or one where Oryza sativa is defined as “a plant that may grow to 1.8 m and produce pendulous inflorescences 50 cm long with edible caryopses”? Science employs as much as possible simple, stable, and widely accepted international classification systems for naming beings and things. The best known of such systems is the Linnaean system for naming organisms by two Latin terms, which refer to genus and species. Classifications are used in other fields, such as astronomy, chemistry, metallurgy, physi…

Keragaman Jenis Tanaman Pada Dua Sistem Pertanian di Pegunungan Arfak Papua Barat

2021

The geographical of Pegunungan Arfak Regency was at 1200 - 2300 meters above sea level, has a mountainous topography, potential for the development of economic highlands crops. The aim this research was to see the diversity of cultivated plant by Arfak people at Arfak mountainous in their field and yard farming system. These studies were conducted at 2 Districts: 1) Anggi: Testega, Bamaha and Kostera Village; 2) Anggi Gida at Tuabiam Village of  Pegunungan Arfak Regency. The data collected by survey technique. The results showed there were a diversity of cultivated plants at two different farming system by Arfak people. There were 30 cultivated plants in four villages; consisted of 9 types …

Effects of Plastic Mulching and Basal Nitrogen Application Depth on Nitrogen Use Efficiency and Yield in Maize

2018

The demand for increased grain production to support population and consumption growth has led to increased interest in field management approaches that incorporate plastic mulching and fertilization management. The purpose of this study was to investigate the effects of plastic mulching and basal nitrogen (N)-fertilizer application depth on N balance estimations, N use efficiency (NUE) and maize yield. The experiment was conducted in 2014 and 2015 with six treatments: no N fertilizer and no mulching (CK), traditional broadcast N fertilizer with mulching (T0), basal N-fertilizer application at a depth of 6 cm with no mulching (T1), basal N-fertilizer application at a depth of 6 cm with plas…

Source shape and data analysis procedure effects on hydraulic conductivity of a sandy-loam soil determined by ponding infiltration runs

2017

Performing ponding infiltration runs with non-circular sources could represent a good means to sample completely an area of interest. Regardless of the shape of the source, predicting the expected reliability of the collected data by infiltrometers should facilitate soil hydraulic characterisation and also allow a more conscious use of the field data. The influence of the shape of the infiltration source (i.e., circular or square) and the analysis procedure of the steady-state infiltration data on the saturated hydraulic conductivity, Ks, of a sandy-loam soil was tested in this investigation. Circular and square surfaces sampled with the pressure infiltrometer (PI) yielded similar estimates…

Offsetting land degradation through nitrogen and water management during maize cultivation under arid conditions

2018

Kā Paleijas Jahnis sawu buhschanu kohpis [Kā Paleijas Jānis savu būšanu kopis]

1844

Pilnasiņu zirgi sacīkstēs un vaislā

1932

Tekstu papildina 20 ilustrācijas un 71 tabula.

Guide pratique de biostatistique

2022

A l’aide de clés de détermination simples et de cartes mentales, l’utilisateur de ce guide pratique pourra facilement identifier le test adéquat pour ses données en biologie et en écologie.Ce guide pratique de Biostatistique permet de choisir le test adapté au cas rencontré par l'étudiant ou l'enseignant en biologie. Il comporte plusieurs originalités majeures, notamment, la présentation des différentes étapes pour le choix et la conduite de tests statistiques pertinents, une adaptation du traitement des données sous R. Il inclut, à la fin de chaque chapitre, un arbre décisionnel des tests et des exercices choisis à partir de données biologiques et écologiques réelles tirées de la littératu…

Baselines and French Forests

2022

International audience