نتایج جستجو برای: growth season
تعداد نتایج: 867084 فیلتر نتایج به سال:
BACKGROUND AND AIMS The mangrove Rhizophora mucronata has previously been reported to lack annual growth rings, thus barring it from dendrochronological studies. In this study the reported absence of the growth rings was reconsidered and the periodic nature of light and dark brown layers visible on polished stem discs investigated. In addition, the formation of these layers in relation to preva...
in order to provide climatology atlas of frosts statistical properties of iran and to attain spatial and temporal pattern of it, daily data of minimum temperature of 62 synoptic weather stations for a 15 year-period (1991-2007) from october to may, were adopted from iran meteorological organization. by choosing may 1st as basis day, five statistical properties and their spatial and temporal dis...
A model of the within-season growth of terrestrial orchids is presented. The model predicts the size of the tubers of Dactylorhiza majalis and Dactylorhiza fuchsii. Therefore, destructive methods can be avoided when sampling these rare orchids. The correlation coefficient and the slope of the relation between two consecutive measurements of leaf area early in the season are good indicators of p...
Interception of photosynthetically active radiation (PAR) was evaluated relative to greenness and normalized difference [MSS (7 5)/(7 + 5)] for five planting dates of wheat for 1978-79 and 1979-80 at Phoenix, Arizona. Intercepted PAR was calculated from leaf area index and stage of growth. Linear relationships were found with greenness and normalized difference with separate relationships descr...
The net ecosystem exchange of carbon dioxide was measured by eddy covariance methods for 3 years in two old-growth forest sites near Santarém, Brazil. Carbon was lost in the wet season and gained in the dry season, which was opposite to the seasonal cycles of both tree growth and model predictions. The 3-year average carbon loss was 1.3 (confidence interval: 0.0 to 2.0) megagrams of carbon per ...
This study investigated the spatiotemporal variation of vegetation growth and the influence of climatic drivers from 1982 to 2011 across China using datasets from the Normalized Difference Vegetation Index (NDVI) and climatic drivers. Long term trends, significance and abrupt change points of interannual NDVI time series were analyzed. We applied both simple regression and multi-regression mode...
Recent research has demonstrated an important interaction between Thielaviopsis basicola, the cause of black root rot, and the root-knot nematode, Meloidogyne incognita (Walker et al., 1998; 1999; 2000). This interaction causes dramatic reductions in early-season growth in producers’ fields and yield reductions of 21 to 44% have been documented in microplot and field research. The interaction i...
Increasing Rice Production Using Different Lime Sources on an Acid Sulphate Soil in Merbok, Malaysia
Acidity is released in high amounts when pyrite-bearing sediments in the coastal plains of Malaysia are drained for development, either agriculture or otherwise. The soils formed from these materials are called acid sulphate soils, which are characterized by low pH and high exchangeable Al that adversely affect plant growth. A study was conducted with the objective of increasing rice yields on ...
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