The system fertilization approach emerged to improve nutrient use efficiency in croplands. This new concept aims at taking advantage of cycling within an agroecosystem obtain maximum production from each unit. To monitor this effect, methodologies such as the Normalized Difference Vegetation Index (NDVI) are promising evaluate plant biomass and content. We evaluated NDVI a predictor shoot bioma...

Accurate and timely spatiotemporal distribution information of soybean is vital for sustainable agriculture development. However, it challenging to establish a phenology-based automated crops mapping algorithm at large spatial domains by simply applying vegetation index temporal profile. This study developed Phenology-based automatic Soybean through combined Canopy water Chlorophyll variations ...

Validation of Leaf Area Index (LAI) derived from moderate resolution remote sensing observations generally involves optical technique to measure ground LAI. As the current validation datasets are derived using multiple optical retrieval techniques, assessment of the consistency between these techniques is required. In this study the effective Plant Area Index (PAIeff) retrievals by three major ...

A growing number of studies have focused on evaluating spectral indices in terms of their sensitivity to vegetation biophysical parameters, as well as to external factors affecting canopy reflectance. In this context, leaf and canopy radiative transfer models are valuable for modeling and understanding the behavior of such indices. In the present work, PROSPECT and SAILH models have been used t...

Worldwide expansion of agriculture is impacting the earth’s climate by altering carbon, water, and energy fluxes, but the climate in turn is impacting crop production. To study this two-way interaction and its impact on seasonal dynamics of carbon, water, and energy fluxes, we implemented dynamic crop growth processes into a land surface model, the Integrated Science Assessment Model (ISAM). In...

Soybean yield largely varies spatially and yearly in farmer fields. Appropriate growth diagnosis is recommended to stabilize the yield. Leaf area index (LAI) a representative diagnostic item, but an evaluation method of LAI dynamics with has not been established. In this study, we utilized function consisting exponential power math function. Parameters were derived from be analyzed variability....

Mass and energy exchanges with the atmosphere were compared in two soybean (Glycine max L. Merr. cv. Harosoy) isolines differing in pubescence density. The study was conducted in a field with a Sharpsburg silty clay loam soil (fine, montmorillonitic, mesic Typic Argiudoll) during the summer of 1980 at Mead, Nebr. Mass and energy exchanges were determined by means of micrometeorological techniqu...

Light-emitting diodes (LEDs) are a rapidly developing technology for plant growth lighting and have become a powerful tool for understanding the spectral effects of light on plants. Several studies have shown that some blue light is necessary for normal growth and development, but the effects of blue light appear to be species-dependent and may interact with other wavelengths of light as well a...

Optimizing the spatial distribution of plants under normal conditions water and fertilizer is widely used by farmers to improve soybean yield. However, relationship between yield plant in field has not been well studied. This study examined effect planting density pattern on growth, components, canopy light interception, dry matter accumulation. We also analyzed photosynthetic rate, accumulatio...

in order to study the canopy temperature effect on protein and soluble sugar, oil percentage and yield of soybean in different planting dates, an experiment was conducted as factorial based on randomized complete block design with three replications in karaj and moghan areas during 2012-13. the studied treatments were included cultivar (‘williams’ and ‘l17’) and planting date (5th of may, 5th o...