Wheat Grain Nitrogen Uptake, as Affected by Soil Total and Mineral Nitrogen, for the Determination of Optimum Nitrogen Fertilizer Rates for Wheat Production

The effect of nitrogen fertilizer applied at seeding on the nitrogen content of wheat grain was studied in 63 experiments during the six seasons 1956-1961. The overall effect of fertilizer was to increase grain nitrogen percentage, but there were situations where no change and even decreases in grain nitrogen percentage were found. The magnitude of the changes due to nitrogen fertilizer was small in relation to change brought about by climatic factors. Both the change in nitrogen content and nitrogen yield from applied fertilizer showed a relation to the nitrogen content of grain from unfertilized plants. Significant differences between varieties were found for nitrogen yield response but not for nitrogen content response.

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The effect of the rate and method of nitrogen application on nitrogen uptake and utilization by broccoli (Brassica oleracea var. italica)

Netherlands Journal of Agricultural Science ◽

10.18174/njas.v47i3.462 ◽

1999 ◽

pp. 201-214 ◽

Cited By ~ 1

Author(s):

A.P. Everaarts ◽

P. De Willigen

Keyword(s):

Nitrogen Uptake ◽

Nitrogen Fertilizer ◽

Dry Matter ◽

Crop Residues ◽

Mineral Nitrogen ◽

Nitrogen Application ◽

Split Application ◽

Band Placement ◽

Broadcast Application ◽

Matter Production

The effect of the rate and method of nitrogen application on nitrogen uptake and utilization by broccoli (Brassica oleracea var. italica) was studied in four field experiments. The methods of application were broadcast application vs band placement and split application. Maximum uptake of nitrogen by the crop was around 300 kg ha-1. In one experiment, band placement positively influenced nitrogen uptake. Split application did not influence nitrogen uptake. Nitrogen application resulted in a higher head dry matter production, but the efficiency of nitrogen utilization for the production of head dry matter decreased with higher amounts of nitrogen applied. Nitrogen application decreased the dry matter content of the heads. In half of the experiments, band placement of nitrogen fertilizer resulted in extra head dry matter production and lower head dry matter contents. At the optimum rates of band placed nitrogen application, the nitrogen harvest index in the experiments ranged from 27 to 30%. The amount of mineral nitrogen in the soil at harvest generally increased with increasing amounts of nitrogen applied. Band placement resulted only in one experiment in lower amounts of mineral nitrogen in the soil at harvest. The mineral nitrogen in the soil at harvest can be unevenly horizontally distributed, both with broadcast application and band placement of nitrogen fertilizer. The amount of nitrogen unaccounted for at harvest increased with increasing amounts of nitrogen applied, but was always less than the amount of nitrogen in crop residues. At the optimum rates of band placed nitrogen application, the amount of nitrogen in crop residues ranged from 120 to 155 kg ha-1. With broccoli cultivation, the nitrogen in the crop residues forms the single largest source of potential loss of nitrogen to the environment.

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EFFECT OF NITROGEN FERTILIZATION IN TRITICALE (X TRITICOSECALE WITTM.), CULTIVATED AFTER DIFFERENT PREDECESSORS. NITROGEN UPTAKE AND EFFICIENCY

AGROFOR ◽

10.7251/agreng1703147g ◽

2018 ◽

Vol 2 (3) ◽

Cited By ~ 1

Author(s):

Mariya GERDZHIKOVA ◽

Neli GROZEVA ◽

Dimitar PAVLOV ◽

Milena TZANOVA

Keyword(s):

Common Wheat ◽

Nitrogen Uptake ◽

Nitrogen Fertilizer ◽

Nitrogen Fertilization ◽

Nitrogen Assimilation ◽

Nitrogen Utilization ◽

The Other ◽

Fertilization Rates ◽

Experimental Base ◽

Fertilizer Rates

The study is conducted at the experimental base of Department of Plant productionat Trakia University, Stara Zagora. Triticale is grown after five predecessors anddifferent nitrogen fertilization rates. The predecessors are wintering peas, springpeas, sunflower, common wheat and triticale. Nitrogen fertilization rates are 0 (N0),40 (N40), 80 (N80), 120 (N120) kg ha-1 after legumes and 0 (N0), 60 (N60), 120 (N120),180 (N180) kg ha-1 after the other predecessors. The influence of the predecessorsand nitrogen fertilization on the nitrogen uptake, assimilated nitrogen fromfertilization, nitrogen utilization and nitrogen required for 100 kg produce oftriticale is established. Nitrogen assimilation from fertilization increases with theincrease of the nitrogen fertilizer rates. With the obtained yield from triticale anaverage of 96.53 kg ha-1 N is extracted from the soil with the grain, 18.97 kg ha-1 Nwith the straw or a total of 115.50 kg ha-1 N. When growing triticale afterleguminous predecessors the utilization of nitrogen is 35.39% and afterpredecessors sunflower, wheat and triticale - 28.76%. Nitrogen required for 100 kgyield of grain of triticale is 1.9 kg of nitrogen when growing after legumepredecessors and 2.8 kg of nitrogen after the other predecessors.

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