plants cover composition, condition, trend, production, and grazing capacity of the rangeland change annually. in this research, the role of temporal rainfall distribution on rangeland production was assessed. this research had down in the rangelands of ilam (with semiarid to semi humid climate) and qom and markazi (with arid to semiarid climate) provinces. by attention on plant cover maps in e...

in order to investigate the effect of different weed-free and weed-infested periods on the growth indices of black seed, a field experiment was conducted at the agricultural research station of ferdowsi university of mashhad, during 2009-2010 growing season. the experiment was laid out in randomized complete block design with 12 treatments and 3 replications. twelve experimental treatments cons...

Plant reserves play a key role in woody perennial plant winter survival and growth resumption the spring. In fruit crops, are critical for production temperate climates when nutrient uptake is minimal photosynthate limited newly emerged leaves. Fall nitrogen (N) fertilization can be used to increase availability of support enhance vegetative following growing season. The objective this study wa...

The data on 6772 growth records of Sirohi goats maintained at All India Coordinated Research Projecton Sirohi goat at Livestock Research Station, Vallabhnagar, Udaipur, India, and recorded between 2004 and 2016, were analysed to study the growth related traits and their genetic control. The overall least squares means of body weight at birth, W3M, W6M, W9M, W12M, were 2.34 ± 0.03, 12.44 ± 0.19,...

1. The cladoeeran Daphnia serves as an example of an iteroparous organism, with overlapping generations, that is eapable of substantial adult growth. The life history of Daphnia was modelIed as the eonsequenee of aseries of decisions about alloeation of energetie resourees to growth and reproduetion. 2. We used numerieal methods to find resouree alloeation patterns that maximized fitness of Dap...

The effects of sex, injuries, season and site on the growth of the spiny lobsters Panulirus gracilis, and P. inflatus, were studied through mark-recapture techniques in two sites with different ecological characteristics on the coast of Guerrero, México. Panulirus gracilis occurred in both sites, whereas P. inflatus occurred only in one site. All recaptured individuals were adults. Both species...

In this study, the relation between leaf area and its dimensions was estimated using a non-destructive method. This method is based on this fact that the leaf shape does not change during the growing season. In this method, leaf area during the growing season is estimated based on the dimensions of the smallest leaf in the initial stage of plant growth or at any growth stage by measuring the le...

Interannual variability in the global land carbon sink is strongly related to variations tropical temperature and rainfall. This association suggests an important role for moisture-driven fluctuations vegetation productivity, but empirical evidence quantify responsible ecological processes missing. Such can be obtained from tree-ring data that a major productivity component: woody biomass growt...

  The population parameters and spawning season of the Spangeld emperor (Lethrinus nebulosus) were studied in coastal waters of Hormouzgan province. The monthly calculated mean values of gonadosomatic index (GSI) of females were indicate to increase from February, reach the highest in March and decline in June. The spawning season peak of L. nebulosus occurred in March. The Von Bertalanffy grow...