Predicting nitrogen requirement in perennial ryegrass seed crops
نویسندگان
چکیده
منابع مشابه
Stem rust in perennial ryegrass seed crops: epidemiological and genetic research at USDA-ARS
In production of perennial ryegrass seed in the Northwest USA, stem rust is the primary disease constraint in terms of management cost and potential yield loss. The USDA-ARS research program on this problem is focused on improved decision making for fungicide use, and tools for genetic improvement. Data from 10 years of field and greenhouse research was used to construct an epidemiological mode...
متن کاملA damage function for stem rust of perennial ryegrass seed crops.
Observations of naturally occurring stem rust epidemics and seed yields in perennial ryegrass were taken in 19 field experiments conducted over the course of 9 years. Epidemic severity differed among years and also among experimental treatments (fungicide regimes) within years. In each experiment, attainable yield was represented by the nondiseased treatment, and yields of other treatments were...
متن کاملControl of blind seed disease (Gloeotinia temulenta) in perennial ryegrass (Lolium perenne) seed crops and implications for endophyte transmission
In three field trials fungicides used for stem rust (Puccinia graminis) control were evaluated to assess the effect on levels of blind seed disease, seed germination and endophyte (Neotyphodium lolii) transmission. Blind seed disease infection was reduced from 24% to 5% in one of the three trials undertaken and germination was increased by between 17 and 23% in two trials. There was a negative ...
متن کاملSimulating perennial ryegrass cutting
Perennial ryegrass is one of the most commonly cultivated forage species in Europe, where grazing and mowing (cutting) are used to manage this resource. Cutting can be characterized by its intensity (height) and its frequency. Combinations of these two factors affect mono-species grasslands productivity and could also modify the genotypic composition of heterogeneous populations. Indeed, the hi...
متن کاملPrediction of stem rust infection favorability, by means of degree-hour wetness duration, for perennial ryegrass seed crops.
ABSTRACT A weather-based infection model for stem rust of perennial ryegrass seed crops was developed and tested using data from inoculated bioassay plants in a field environment with monitored weather. The model describes favorability of daily weather as a proportion (0.0 to 1.0) of the maximum possible infection level set by host and inoculum. Moisture duration and temperature are combined in...
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ژورنال
عنوان ژورنال: NZGA: Research and Practice Series
سال: 2010
ISSN: 2463-4751,0110-8581
DOI: 10.33584/rps.14.2008.3190