EFFECTS OF NITROGEN FERTILIZER APPLICATION RATES TO GRASS PASTURES ON LAMB GAINS AND HERBAGE YIELDS

1965 ◽  
Vol 45 (2) ◽  
pp. 79-83 ◽  
Author(s):  
C. D. T. Cameron
Keyword(s):  
Nitrogen Fertilizer ◽  
Nitrogen Fertilization ◽  
Dry Matter ◽  
Fertilizer Application ◽  
Quadratic Regression ◽  
Grazing Season ◽  
Nitrogen Levels ◽  
Application Rates ◽  
Quadratic Effects ◽  
Total Digestible Nutrient

A comparison of lamb gains, calculated total digestible nutrient (T.D.N.) production, and dry-matter (D.M.) yields of grass pasture fertilized at 0, 56, or 112 kg of nitrogen per hectare was carried out from 1961 through 1963. Total lamb gains and T.D.N. production were increased linearly with level of nitrogen fertilization. On D.M. yields both the linear and quadratic effects of nitrogen levels were significant. Year differences in T.D.N. and D.M. production were significant as measured by the quadratic regression. On total animal gain both the linear and quadratic effects of years were highly significant. These results were associated with a relatively short grazing season in 1963.

THE EFFECTS OF NITROGEN FERTILIZER APPLICATION RATES TO GRASS ON FORAGE YIELDS, BODY WEIGHT GAINS, FEED UTILIZATION, AND VITAMIN A STATUS OF STEERS

1966 ◽  
Vol 46 (1) ◽  
pp. 19-24 ◽  
Author(s):  
C. D. T. Cameron
Keyword(s):  
Body Weight ◽  
Vitamin A ◽  
Nitrogen Fertilizer ◽  
Dry Matter ◽  
Nutritive Value ◽  
Fertilizer Application ◽  
Beef Steers ◽  
Nitrogen Levels ◽  
Weight Gains ◽  
Liver Vitamin

The dry matter yield of grass forage was increased linearly with nitrogen fertilizer levels of zero, 56, and 112 kg per hectare applied annually in the spring of 1961, 1962, and 1963. Nitrogen levels had little effect on the nutritive value of mature grass forage as indicated by voluntary dry matter intake and body weight gains of beef steers. The apparent digestibility of crude protein increased and that of dry matter and nitrogen-free extract decreased linearly with increasing nitrogen fertilizer rates. Digestibility of crude fiber and ether extract were not altered significantly by nitrogen levels. Forage-carotenes sustained relatively high liver vitamin A levels over a 100-day feeding period. Nitrogen levels had little effect on the rate of liver vitamin A depletion.

INTAKE AND DIGESTIBILITY OF NITROGEN-FERTILIZED GRASS HAYS BY WETHERS

1967 ◽  
Vol 47 (2) ◽  
pp. 123-125 ◽  
Author(s):  
C. D. T. Cameron
Keyword(s):  
Nitrogen Fertilizer ◽  
Crude Protein ◽  
Dry Matter ◽  
Fertilizer Application ◽  
Nutrient Digestibility ◽  
Apparent Digestibility ◽  
Application Rates ◽  
Nitrogen Free Extract ◽  
Unit Body Weight ◽  
Nitrogen Rates

Conventional digestion experiments were conducted with wethers to determine the effects of varying nitrogen fertilizer application rates to grass on the intake and digestibility of mature grass hays.Nitrogen fertilizer rates had little effect on dry matter intake.The apparent digestibility of crude protein increased and that of dry matter and nitrogen-free extract decreased linearly (P < 0.01) with increasing nitrogen fertilizer rates.The mean dry matter intake was greater (P < 0.01) per unit body weight and less (P < 0.01) per unit metabolic body size (wt. 0.75) than that previously reported for concurrent digestion experiments with steer calves fed these forages. The apparent digestibility of the dry matter, crude protein, crude fiber, and nitrogen-free extract was less (P < 0.01) in wethers than in steers. There were no significant interactions of species × nitrogen rates for intake and nutrient digestibility.

scholarly journals Responses of Root Characteristic Parameters and Plant Dry Matter Accumulation, Distribution and Transportation to Nitrogen Levels for Spring Maize in Northeast China

Agriculture ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 308
Author(s):  
Yang Yu ◽  
Chunrong Qian ◽  
Wanrong Gu ◽  
Caifeng Li
Keyword(s):  
Surface Area ◽  
Nitrogen Fertilizer ◽  
Root Length ◽  
Dry Matter ◽  
Projection Area ◽  
Dry Matter Accumulation ◽  
Characteristic Parameters ◽  
High Nitrogen ◽  
Nitrogen Levels ◽  
Matter Transport

Improving nitrogen use efficiency is a significant scientific problem to be solved. Two maize hybrids JD27 (Jidan 27) and SD19 (Sidan 19) were selected to study the effects of nitrogen levels on root characteristic parameters and plant dry matter accumulation, distribution and transportation. We set five different nitrogen levels, which were nitrogen deficiency (000N), low nitrogen (075N), medium nitrogen (150N), high nitrogen (225N) and excessive nitrogen (300N). The results showed that the root length and root surface area of JD27 were significantly higher than those of SD19 under 075N. With the increase of nitrogen levels, the root difference among varieties gradually decreased. The root length, projection area, total surface area and total volume reached the maximum values at silking stage. The average root diameter kept stable or decreased slowly with the growth stage. The dry matter accumulation of JD27 was higher than that of SD19 at all growth stages. Increasing the amount of nitrogen fertilizer can promote the transport of dry matter to grain and improve dry matter transport efficiency after anthesis. Under the treatment of medium and high nitrogen fertilizer, maize was easy to obtain a higher yield, but excessive nitrogen fertilizer inhibited the increase of yield. This study provides theoretical and practical guidance for maize production techniques.

Milk production from cows grazing on tropical grass pastures. 1. Effects of stocking rate and level of nitrogen fertilizer on the pasture and diet

1985 ◽  
Vol 25 (3) ◽  
pp. 505 ◽  
Author(s):  
TM Davison ◽  
RT Cowan ◽  
RK Shepherd ◽  
P Martin
Keyword(s):  
Protein Content ◽  
Milk Production ◽  
Nitrogen Fertilizer ◽  
Crude Protein ◽  
Dry Matter ◽  
Fertilizer Application ◽  
Stocking Rate ◽  
Crude Protein Content ◽  
Stocking Rates ◽  
Applied Nitrogen

A 3-year experiment was conducted at Kairi Research Station on the Atherton Tablelands, Queensland, to determine the effects of stocking rate and applied nitrogen fertilizer on the pasture yield and composition, diet selection by cows, and soil fertility of Gatton panic (Panicum maximum cv. Gatton) pastures. Thirty-two Friesian cows were used in a 4x2 factorial design: four stocking rates (2.0, 2.5, 3.0 and 3.5 cows/ha), each at two rates of fertilizer application 200 and 400 kg N/ha.year. The higher rate of fertilization increased the pasture green dry matter on offer at all samplings (P < 0.01); the increase ranged from 1 106 kg/ha in summer to 548 kg/ha in spring. Green dry matter decreased ( P< 0.0 1) with increasing stocking rate, with mean yields of 3736 and 2384 kg/ha at 2.0 and 3.5 cows/ha, respectively. Weed yields increased over the 3 years at the higher stocking rates for pastures receiving 200 kg N/ha.year. The crude protein content of leaf and stem increased with increasing stocking rate and amount of applied nitrogen fertilizer. Values ranged from 12.1 to 26.5% of dry matter (DM) in leaf and from 3.7 to 13.8% DM in stem. In leaf, sodium concentration (range 0.05-0.20% DM) was increased, while phosphorus concentration (range 0.21-0.44% DM) was decreased by the higher rate of fertilizer application. Plant sodium and phosphorus levels were inadequate for high levels of milk production. Dietary leaf content and crude protein contents were consistently increased by both a reduced stocking rate, and the higher rate of fertilization. Cows were able to select for leaf and at the lowest stocking rate, leaf in the diet averaged 38%; while the leaf content of the pasture was 20%. Dietary leaf content ranged from 38 to 57% in summer and from 11 to 36% in winter. Dietary crude protein ranged from 13 to 15% in summer and from 7 to 11% in winter and was positively correlated with pasture crude protein content and dietary leaf percentage. Soil pH decreased (P<0.05) from an overall mean of 6.3 in 1976 to 6.1 at 200 N and 5.8 at 400 N in 1979. Soil phosphorus status remained stable, while calcium and magnesium levels were lower (P<0.01) after 3 years.

scholarly journals Response of Nerica Rice to Nitrogen Fertilization

2016 ◽  
Vol 18 (2) ◽  
pp. 9-14
Author(s):  
R Shultana ◽  
MAA Mamun ◽  
L Naher ◽  
MAK Bhuiyan ◽  
AJ Mridha
Keyword(s):  
Regression Analysis ◽  
Nitrogen Fertilizer ◽  
Nitrogen Fertilization ◽  
Research Field ◽  
Optimum Dose ◽  
Rice Varieties ◽  
Optimum Rate ◽  
Nitrogen Levels ◽  
Research Institute

An experiment was conducted during T. Aman season, 2014 at the Agronomy Research Field, Bangladesh Rice Research Institute, Gazipur to determine the optimum rate of nitrogen fertilizer for higher yield in nerica rice. The experiment comprised of three rice varieties viz. NERICA1, NERICA10 and BRRI dhan57; and five nitrogen levels viz. 0, 23, 46, 69 and 92 kg ha-1. The rice var. BRRI dhan57 with 69 and 92 kg N ha-1 produced significantly identical with higher panicles m-2. But NERICA1 and NERICA10 produced higher number of panicles with 46 and 69 kg N ha-1, respectively. However, BRRI dhan57 with 46 kg N ha-1 produced highest grains panicle-1 but NERICA1 and NERICA10 produced higher number of grains panicle-1 with 23 kg N ha-1. The highest percentage of sterility was recorded in NERICA10 with 69 kg N ha-1. The regression analysis gave the optimum dose of nitrogen for NERICA1, NERICA10 and BRRI dhan57 which were 69.25, 74.25 and 85.75 kg N ha-1, respectively.Bangladesh Agron. J. 2015, 18(2): 9-14

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