Effects of Time of Nitrogen Application on Yield of Maize in the Tropics

1966 ◽  
Vol 2 (2) ◽  
pp. 101-105 ◽  
Author(s):  
Adeboyejo A. Fayemi
Keyword(s):  
Nitrogen Fertilizer ◽  
Crude Protein ◽  
Crude Protein Content ◽  
Nitrogen Application ◽  
Time Of Application ◽  
Cropping Season ◽  
Maize Grain ◽  
High Yields ◽  
The Tropics ◽  
Maize Ear

SummaryA four-year study from 1958 to 1962 showed that time of application of fertilizer nitrogen greatly influenced the yield of grain, the percentage of nitrogen and the crude protein of the grain under Nigerian conditions characteristic of the early maize cropping season from March to July. Split applications of nitrogen fertilizer significantly increased maize grain yield by 35 per cent when two equal doses were given one month and two months after planting; and by 31 per cent when four equal doses were supplied at planting and one month, two months and three months after seeding. Yield was significantly reduced when application was delayed two months after planting. High yields of maize were not obtained by supplying the whole of nitrogen fertilizer at one time, eidier at sowing or any time later during the growing season. However, applying all of the nitrogen fertilizer one month after planting significantly increased the percentage of nitrogen and of the crude protein content of the grain. The maize ear weight was favourably influenced by spreading the nitrogen application over the three-month period of the maize growth.

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.

The seasonal distribution of nitrogen fertilizer dressings on pure perennial ryegrass swards

1984 ◽  
Vol 103 (3) ◽  
pp. 659-669 ◽  
Author(s):  
D. Reid
Keyword(s):  
Perennial Ryegrass ◽  
Nitrogen Fertilizer ◽  
Crude Protein ◽  
Dry Matter ◽  
Distribution Patterns ◽  
Seasonal Distribution ◽  
Experimental Designs ◽  
Residual Effects ◽  
Nitrogen Application ◽  
Yield Distribution

SummaryIn studies of the seasonal distribution of nitrogen fertilizer dressings on grassland using conventional experimental designs it is usually not possible to separate the true effects of an individual fertilizer dressing on the yield at a particular cut from the residual effects of previous dressings. An experiment is described which was designed to allow separation of the direct and residual effects, with certain restrictions, for a system involving five cuts and five possible fertilizer dressings per season on perennial ryegrass swards. From the results obtained over two harvest years on swards on two adjacent sites equations were derived relating the dry-matter and crude-protein yields of herbage to the rate of nitrogen application at five dressings in the season. Predictions of yield distribution patterns from the equations are compared with observed yields from various sequences of nitrogen dressings included in previous experiments at this Institute. Examples are also given of the prediction of sequences of nitrogen dressings required to obtain certain patterns of yield distribution.

scholarly journals Yield and Nutritive Value of Sorghum, Maize and Soybean Forages Harvested in Southwestern Puerto Rico.

1969 ◽  
Vol 63 (3) ◽  
pp. 400-411
Author(s):  
D. G. St. Louis ◽  
J. A. Arroyo-Aguilú ◽  
A. Ramírez-Ortiz ◽  
R. E. McDowell
Keyword(s):  
Zea Mays ◽  
Puerto Rico ◽  
Glycine Max ◽  
Protein Content ◽  
Crude Protein ◽  
Nutritive Value ◽  
Grain Sorghum ◽  
Crude Protein Content ◽  
Forage Sorghum ◽  
High Yields

Six varieties of forage sorghum (Sorghum bicolor) and sorghum X sudangrass hybrids (S. bicolor X S. sudanese), six varieties of grain sorghum (S. bicolor) and three varieties each of maize (Zea mays) and soybean (Glycine max) were grown in 1.2 x 3.7 m plots at the Lajas Experiment Substation. All plots were harvested in the boot, flower and dough stages. Ratoons of the sorghum varieties were also harvested after 45 days of regrowth until the stands diminished. The forage sorghums and maize had higher yields of green and dry material than the grain sorghums. However, only the grain sorghums showed any significant increase in yield as the crop matured. All crops decreased in nutritive value with advance in age. In general, maize was higher in nutritive value than the forage sorghums. Results indicated that forage sorghums can be recommended due to high yields of good quality forage on irrigated lands on the south coast. However, results with soybean forage were poor. It does not appear feasible to produce soybeans to enhance the crude protein content of forage pellets.

Effects of Nitrogen Application on Nitrogen Content of Grains of Swamp Rice in Sierra Leone

1972 ◽  
Vol 8 (2) ◽  
pp. 155-160 ◽  
Author(s):  
D. K. Das Gupta
Keyword(s):  
Protein Content ◽  
Sierra Leone ◽  
Crude Protein ◽  
N Uptake ◽  
Crude Protein Content ◽  
Nitrogen Application ◽  
N Application ◽  
Total N ◽  
Rice Grains ◽  
Nitrogenous Fertilizer

SUMMARYThe total N uptake, crude protein content, and recovery of N in rice grains varied with varieties. Increased levels of N application gave increases in total N uptake and crude protein content in the grains, though recovery of N in the grains decreased with increased levels of nitrogen application. Irrespective of varieties and levels of application, three split dressings of nitrogenous fertilizer gave greater total N uptake, crude protein content, and recovery of N in the rice grains than where all the N was applied at the time of transplanting of seedlings.

scholarly journals PENGARUH TINGKAT PEMUPUKAN NITROGEN DAN NAUNGAN TERHADAP KERAGAAN DAN KANDUNGAN PROTEIN KASAR RUMPUT Brachiaria humidicola

ZOOTEC ◽  
2015 ◽  
Vol 36 (1) ◽  
pp. 238
Author(s):  
Juneidid S. Togelang ◽  
D. A. Kaligis ◽  
F. Dompas ◽  
N. Bawoleh
Keyword(s):  
Protein Content ◽  
Nitrogen Fertilizer ◽  
Crude Protein ◽  
Block Design ◽  
The Other ◽  
Crude Protein Content ◽  
Brachiaria Humidicola ◽  
Simultaneous Test ◽  
Four Levels ◽  
Different Levels

THE EFFECTS OF NITROGEN FERTILIZER AND SHADING LEVELS ON PERFORMANCE AND CRUDE PROTEIN CONTENT OF Brachiaria humidicola. The aim of this experiment was to study the effects of different levels of shading and nitrogen on the performance and nitrogen content of B. Humidicola. The treatment were consisted of four levels of nitrogen in from of urea fertilizer: P1 = 0 kg/Ha, P2 = 50 kg/Ha, P3 = 100 kg/Ha, P4 = 150 kg/Ha, and three levels of shading: N1 = 0%, N2 = 40% dan N3 = 70%. Treatmens   was arranged in infactorial based on ramdomized block design (RBD). Date was analysis by using Minitab Version 11, and followed with Turkey Simultaneous Test, to determined the different among treatments, from analysis of variance. The result showed the higher number of tiller was found at the interaction of P3N1, P4N1, P2N2 and P3N2, with significantly different compared to the other interactions. Furthermore, analysis of varians showed the interaction of the treatments were effected significantly on the content of crude protein (P < 0,05) where the interaction of N1P4 has the crude protein content 9,74% significantly higher (P < 0,05) compared to other interactions. On the other hand the interaction of the treatments was not effected significantly (P < 0,05) on the leaf: steam ratio. Based on the result of this experiment it can be concluded that B. humidicola responsive to nitrogen farilizer up to 100 kg urea/Ha to provide optimal performance and crude protein content under shade of 40%. Keywords: Nitrogen, Shading Performance, Crude Protein, humidicola.

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