...Figure 6. Size-frequency diameters of Zea mays pollen grains: modern, Pueblo II, and fossil midden samples A through E from Chaco Canyon, New Mexico; the Pueblo II Zea pollen is from the Spadefoot Toad site at Chaco Canyon dated AD 950 to 1050; the modern pollen is from Greer Laboratories. ...

... Agricultural Complex beginning ca. 450 CE, centuries before the emergence of Cahokia at 1050 CE. Agricultural intensification that included the use of maize ( Zea mays subsp. mays ) followed this initial clearance, with peak land use intensity between 900 and 1200 CE. A large flood event ca. 1200 CE marks...

... management practices of select annual- and perennial-based biofuel cropping systems. The cropping systems were continuous corn ( Zea mays L.; harvested for both grain and ∼50% of the corn stover) with and without a winter cereal rye ( Secale cereale L. ssp. cereale ) cover crop, mixed prairies (harvested...

... measurements in dry soil. Three irrigation intensities created severe, intermediate, and no water stress conditions in lysimeters with growing maize ( Zea mays L.) plants. By monitoring matric potentials using POTs, levels of local water stress in our experiments were better defined. When the defined stress...

...) and no tillage (NT) corn ( Zea mays L.) plots, with volumetric water contents values recorded every 10 min for a 30-mo period. Three water parameters (cumulative water storage, net water storage, and drainage below 55 cm) were grouped for statistical analysis by rainfall amounts and “seasons” of primary periods...

... in southern Brazil cultivated for 32 years with a rotation of soybeans ( Glycine max L.), maize ( Zea mays L.), wheat ( Triticum aestivum L.), and oats ( Avena strigosa L.) with and without K fertilization. Mineral sources of K were identified by X-ray diffraction and by sequential chemical extraction from...

... therefore grew maize ( Zea mays L.) in field lysimeters in 2013 and tested the ability of six model configurations (two crop models CERES (Crop Environment Resource Synthesis) and SPASS (Soil–Plant–Atmosphere System Simulation) combined with three evapotranspiration models) to simulate measured sap flow...

... by comparison with spatially distributed crop yield measurements. A 25-ha field located in the Venice coastland, Italy, cultivated with a maize ( Zea mays L.) crop and characterized by a highly heterogeneous soil subject to salt contamination, has been extensively studied by soil sampling, geophysical surveys...

... by revealing which parameter variations or uncertainties have the greatest impact on model outputs. In this work, the elementary effects method was used to obtain global sensitivity analyses of UNSATCHEM seasonal simulations of forage corn ( Zea mays L.) production with differing irrigation rates and water...

... mobility inside a pot containing soil and roots. Tractography generates channels that constitute pathways of facilitated water movement, representing the roots, calculated from water diffusion properties obtained from DTI experiments. Examples of pea ( Pisum sativum L.) and corn [ Zea mays L. var...