Trends in Iowa Wildlife Populations and Harvest 2010, October 2011

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2011, October 2012

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2012, October 2013

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2013, December 2014

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2001, October 2002

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2002, September 2003

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2003, December 2004

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2004, October 2005

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2005, December 2006

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2006, December 2007

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2007, September 2008

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2008, September 2009

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Production of annual winter forage sown before and after soybean harvest under different nitrogen fertilization levels

The objective of this work was to evaluate the effect on forage yield of sowing winter forage species before and after soybean harvest, at different nitrogen application levels. The experiment was set out in a randomized block design with a strip-split plot arrangement, and three replicates. Sowing methods (18 days before soybean harvest and six days after soybean harvest) were allocated in the main plots, and the combination among forage species (Avena strigosa cv. IAPAR 61 + Lolium multiflorum; A. strigosa cv. Comum + L. multiflorum; A. strigosa cv. Comum + L. multiflorum + Vicia villosa; A. strigosa cv. Comum + L. multiflorum + Raphanus sativus; and L. multiflorum) and nitrogen levels (0, 140, 280 and 420 kg ha-1) in the plots and subplots, respectively. Forage sowing before the soybean harvest made it possible to anticipate first grazing by 14 days, with satisfactory establishment of forage species without affecting forage production. This method permitted a longer grazing period, preventing the need for soil disking, besides allowing the use of no-tillage system. The mixture of forage species enables higher forage yield for pasture in relation to single species pastures, with response to nitrogen fertilization up to 360 kg ha-1.

Water stress before harvest of pepper-rosmarin

The objective of this work was to assess the effect of different periods of water stress before harvest of pepper-rosmarin (Lippia sidoides) on the contents of essential oil and flavonoids. The experiment was carried out during 270 days of cultivation, with drainage lysimeters, in a completely randomized block design with five treatments: 0, 2, 4, 6, and 8 days of water suppression before harvest, with four replicates. Fresh and dry matter yield, essential oil content, total flavonoids content, and water potential and temperature of leaves were determined. There was a decrease of approximately 50% in oil content and of 60% in total flavonoid content with the reduction of leaf water potential in 0.3 MPa. Essential oil is more sensitive to water stress than total flavonoids.

Long-term changes in rice development in Southern Brazil, during the last ten decades

The objective of this work was to test long-term trends in the duration of rice development phases in Santa Maria, RS, Brazil. The duration from emergence to V3 (EM-V3), emergence to panicle differentiation (EM-R1), emergence to anthesis (EM-R4), and emergence to all grains with brown hull (EM-R9) was calculated using leaf appearance and developmental models for four rice cultivars (IRGA 421, IRGA 417, EPAGRI 109, and EEA 406), for the period from 1912 to 2011, considering three emergence dates (early, mid, and late). The trend of the time series was tested with the non-parametric Mann-Kendall test, and the magnitude of the trend was estimated with simple linear regression. Rice development has changed over the last ten decades in this location, leading to an anticipation of harvest time of 17 to 31 days, depending on the cultivar maturity group and emergence date, which is related to trends of temperature increase during the growing season. Warmer temperatures over the evaluated time period are responsible for changing rice phenology in this location, since minimum and maximum daily temperature drive the rice developmental models used.