The effects of different levels of N, P and K on the yields, nitrogen content and kernel weights of malting barley (var. Proctor)

Abstract

The effects of N, P and K applied broadcast on yields, percentage nitrogen and kernel weights of barley were studied over two seasons.The average yield increase over thirteen sites was 5-1 cwt and 8-2 cwt from applications of 35 lb and 70 lb/acre of fertilizer N respectively. A mean yield increase of 4-4 cwt/ acre was obtained from 27 lb P at four sites where the soil phosphorus test did not exceed 2 ppm P. Potassium applied at rates varying from 0 to 168 lb K/acre increased yields at one site only and decreased them at another site.The mean grain nitrogen percent without fertilizer N was 1-47 and applications of 35 and 70 lb N/acre gave increases of 0-06 and 0-19 % respectively. The overall effects of P and K on the percent nitrogen in the grain were small.Applications of 35 and 70 lb N/acre increased the mean 1000 kernel weights by 0-7 and 1-0 g respectively. When lodging occurred kernel weights were decreased. Fertilizer P and K had little effect on the kernel weights.The significance of these data are discussed in relation to previous cropping and rainfall during the growing season and during the previous winter.

Variation in starch, protein, and fibre of Canadian barley cultivars

“…Starch concentration varied from environment to environment for both two-row and six-row barley cultivars ( (Car et al 1992), soil pH (Calder and Macleod 1974), weather (Gately 1968 (Bhatty et al 1974) and on swine (Bhatty et al 1979). Two-row and six-row barleys produced the same growth in broiler chicks (Classen et al 1985).…”

Comparative effect of six cultivars at four rates of nitrogen on the grain yield and grain quality of spring-sown malting barley in Ireland

“…between varieties. In a study of trials carried out by the National Increasing increments of fertilizer nitrogen inlnstitute of Agricultural Botany over the 5-year period creased both the grain yield and grain protein content 1962-67, Dent et al (1968) reported that although of spring malting barley (Widdowson et al 1961, differences in the grain nitrogen content of spring 1982; Gately 1968;Timmer el al. 1991).…”

Protein production and nitrogen utilization by barley cultivars in response to nitrogen fertilizer under varying moisture conditions

“…La r6ponse h la fumure pour la teneur en N de la paille, I'absorption de N total et l'indice de (Reisenauer and Dickinson 1961;Gately 1968; O 'Neill et al 1983;Jackson and Dubbs 1987), although with low levels of N fertilization, protein concentration often remained constant or decreased (Zubriski et al 1970;Gately and McAleese 1975;Walker 1915;Bole and Pittman 1980;Lord and Vaughan 1987). Protein concentration ofbarley was also influenced by environmental conditions and Gatley (1968) found that weather was the main factor influencing grain N concentration.…”

“…Protein concentration and yield tend to be inversely related (Zubriski 1970;Gately and McAleese 1976: Jackson and Dubbs i987; Lord and Vaughan 1987). The increase in protein concentration with increasing N level tended to be lower at higher moisture contents (Bole and Pittman 1980).…”