Forage & Grain Report 2011
http://hdl.handle.net/10150/209309
2024-03-28T08:14:44ZLate N management in durum wheat using crop models and canopy reflectance
http://hdl.handle.net/10150/211156
Late N management in durum wheat using crop models and canopy reflectance
Wang, Guangyao (Sam); Ottman, Michael; Thorp, Kelly
Ottman, Michael J.
Optimizing late N applications in durum wheat is highly needed to obtain adequate protein levels without affecting grain yield. A simple and rapid method for estimating crop yield at flowering stage and crop N status is required to make immediate N application decisions for increasing grain protein content. There were significant differences in grain yield and grain protein among N treatments and durum varieties. Using information on soil properties, weather data, crop management, and variety growth, DSSAT crop model predicted durum grain yield accurately. Canopy reflectance index NDVI at flowering time were closely correlated with crop yield and protein content. The results indicate the potential of using crop models and canopy reflectance index in durum wheat yield prediction and N management.
2012-02-01T00:00:00ZEffects of Zn fertilizer on cadmium accumulation in durum wheat
http://hdl.handle.net/10150/211139
Effects of Zn fertilizer on cadmium accumulation in durum wheat
Wang, Guangyao (Sam); Ottman, Michael; Chaney, Rufus L.
Ottman, Michael J.
Proposed reduction in maximum allowable cadmium (Cd) level in wheat grain from 0.2 to 0.15 ppm by European Union (EU) could affect Arizona wheat growers substantially. The possible breeding programs and management practices needs to be developed to keep the industry competitive for this major market. In this study, we used two durum wheat cultivars (Ocotillo representing higher Cd genotypes and Havasu representing lower Cd genotypes) to study the potential of Zn fertilizer (as ZnSO₄ and ground tire rubber) to reduce Cd uptake in durum wheat at Yuma Ag Center. While cadmium level in the two varieties were different significantly, applying ZnSO₄ or ground rubber did not affect grain cadmium level, grain yield, or protein content significantly.
2012-02-01T00:00:00ZSilage Corn Variety Trial in Central Arizona
http://hdl.handle.net/10150/211155
Silage Corn Variety Trial in Central Arizona
Subramami, Jay; Loper, Shawna
Ottman, Michael J.
Information on silage corn yield and quality can help silage growers and users choose varieties that best fit their needs and area. We conducted a silage corn variety trial using seven varieties for use in Central Arizona. Variety 28Z47 produced the higher silage yield with an average of 30.4 ton/acre and the variety 28V71 had the highest crude protein content (8.13%) among the eight. Varieties that produced higher yield, higher crude protein, and lower NDF than the average of the eight varieties were 851VT3 and TMF-2L-872.
2012-02-01T00:00:00ZInvinsa Application to Reduce Water Stress Effects on Corn Growth and Yield at Maricopa, AZ, 2011
http://hdl.handle.net/10150/211154
Invinsa Application to Reduce Water Stress Effects on Corn Growth and Yield at Maricopa, AZ, 2011
Ottman, M. J.; Kimball, B. A.
Ottman, Michael J.
Invinsa blocks ethylene perception by plants and can reduce the negative effects of water stress on crop growth. The objective of this study is to measure the effect on corn growth and yield of Invinsa application at incipient water stress. A study was conducted at the University of Arizona Maricopa Agricultural Center where Invinsa was applied on 15 June and 20 June in blocks with adequate irrigation or deficit irrigation, which received no irrigation water for 10 days past incipient stress beginning on 15 June. Invinsa had inconsistent effects on corn growth and yield. The most notable effect of Invinsa, however, was an increase in total plant yield from 11.09 to13.43 t/a measured on 23 July and from 11.36 to 13.61 t/a measured on 13 Aug in the adequate irrigation block for Invinsa application on 15 June. However, Invinsa had no effect on final grain yield. The lack of a consistent response to Invinsa may be explained by the higher than optimum temperature at time of application or other unknown factors.
2012-02-01T00:00:00Z