Toward a standardized statistical methodology comparing optimum nitrogen rates among management practices: A bootstrapping approach

Hannah R. Francis; Ting Fung Ma; Matthew D. Ruark

doi:10.1002/ael2.20045

Effect of seedling age, seeding density and nitrogen fertilizer on growth and grain yield of rice (Oryza sativa L.)

International Journal of Applied Biology ◽

10.20956/ijab.v3i1.6688 ◽

2019 ◽

Vol 3 (1) ◽

pp. 81

Author(s):

Saroj Thapa ◽

Khagendra Thapa ◽

Jiban Shrestha ◽

Amit Chaudhary

Keyword(s):

Oryza Sativa ◽

Grain Yield ◽

Management Practices ◽

Oryza Sativa L ◽

Critical Factor ◽

Growth And Yield ◽

Seeding Density ◽

Potential Yield ◽

Seedling Age ◽

Nitrogen Rates

Rice (Oryza sativa L.) is first staple crop of Nepal. The national average yield of rice is less than its potential yield, for which poor agronomic management has been reported as the critical factor. Among various agro-management practices seedling age, seeding density and nitrogen rates significantly affect the growth and yield of rice. The lower seeding density produces the taller plant, more effective tiller, lower sterility and higher grain yield. On the other hand, seedling of older age from higher seeding density gives the lowest yield. Transplanting younger seedling with low seeding density and application of recommended dose of nitrogen gives a higher yield. This article summarizes various effects of seedling age, seeding density and nitrogen rates on plant height, number of effective tillers, number of filled grains, thousand grain weight and grain yield of rice. This information may be useful for maize growers and researchers.

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Impact of management practices on Italian ryegrass seed quality

Journal of Agricultural Sciences Belgrade ◽

10.2298/jas1002131s ◽

2010 ◽

Vol 55 (2) ◽

pp. 131-140

Author(s):

Aleksandar Simic ◽

Savo Vuckovic ◽

Branko Cupina ◽

Djordje Krstic ◽

Rade Stanisavljevic ◽

...

Keyword(s):

Environmental Conditions ◽

Seed Weight ◽

Management Practices ◽

Field Experiments ◽

Seed Quality ◽

Italian Ryegrass ◽

Considerable Influence ◽

Nitrogen Rates ◽

Thousand Seed Weight

Thousand-seed weight and total germination from the first production year and two seed harvests were measured in tetraploid Italian ryegrass (cv. Tetraflorum) to study variations in seed quality. Four-year field experiments were carried out (2002-2006) in western Serbia and Italian ryegrass was established with three row spacings (20, 40 and 60 cm), four seeding rates (5, 10, 15 and 20 kg ha-1) and using four spring nitrogen rates (0, 50, 100 and 150 kg ha-1). High seed quality was obtained, except for the first experimental year (2003) and the second seed harvests which yielded the seed of unsatisfactory quality and validity. Applied factors and treatments did not change seed quality significantly unlike environmental conditions of production years which had considerable influence on seed quality.

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Application of controlled-release nitrogen fertilizer in irrigated common bean crops

Comunicata Scientiae ◽

10.14295/cs.v10i1.2995 ◽

2019 ◽

Vol 10 (1) ◽

pp. 158-167 ◽

Cited By ~ 1

Author(s):

Renato Augusto de Oliveira ◽

Wilian Henrique Diniz Buso ◽

Leandro Lopes Gomes ◽

Pedro Henrique Marques Martins ◽

Renato Souza Rodovalho ◽

...

Keyword(s):

Controlled Release ◽

Common Bean ◽

Nitrogen Fertilizer ◽

Management Practices ◽

Block Design ◽

Brazilian Cerrado ◽

Area Index ◽

Cerrado Biome ◽

The Common ◽

Nitrogen Rates

The use of adequate management practices and high nitrogen fertilizer rates have contributed to increase the common bean grain yield, however, the application of nitrogen fertilizer at sowing still requires evaluations for irrigated crops in the Brazilian Cerrado biome region. Thus, the objective of this work was to evaluate the effect of application of different rates of controlled-release nitrogen fertilizer—dimethylpyrazole phosphate (DMPP)—at sowing and as top-dressing on agronomic performance and leaf area index of irrigated common bean crops grown in the Brazilian Cerrado biome region. A randomized block design in a 4×3 factorial arrangement with four replications was used. The treatments consisted of four nitrogen rates (0, 60, 120, and 180 kg ha-1) and three application forms (100% at sowing, 100% as top-dressing, and 50% at sowing + 50% as top-dressing). Irrigation was managed with class A tanks and two-day intervals. The nitrogen applied at the different stages of the crop did not affect the production components of the common bean plants. The highest grain yields were found with the nitrogen rates of 180 kg ha-1 in 2015 (1,756.37 kg ha-1), and 123.98 kg ha-1 in 2016 (1,799.63 kg ha-1).

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Yields and Nitrogenous Fertiliser Use Efficiency Responses of Clonal Tea (Camellia Sinensis) to Locations of Production

International Journal of Tea Science ◽

10.20425/ijts.v13i01-02.9983 ◽

2017 ◽

Vol 13 (01-02) ◽

Author(s):

Karl W. Nyabundi ◽

P. Okinda Owuor ◽

Godfrey W. Netondo ◽

John K. Bore

Keyword(s):

Nitrogen Availability ◽

Management Practices ◽

Nitrogen Fertiliser ◽

Application Rates ◽

Use Efficiency ◽

Fertiliser Application ◽

Fertiliser Use ◽

Yield Responses ◽

Nitrogen Rates ◽

Nitrogen Contents

Tea husbandry practices in Kenya are uniform despite variations in responses to agronomic inputs with locations. Nitrogen availability is the most limiting tea/crop growth factor. However, tea yields vary with region of production even with the same cultivar, suggesting responses to nitrogen fertiliser and nitrogen utilisation may vary with locations. Nitrogen use efficiency (NUE) of clone TRFK 6/8 was investigated across three different locations/environments in western Kenya. Yields responded significantly (pd”0.05) to nitrogen fertiliser rates, but the responses varied with location of production. The responses to nitrogen rates were significantly lower (pd”0.05) in Timbilil than in Arroket and Changoi. This suggests that optimal nitrogenous fertiliser application rates should vary with locations. Nitrogen application rates between 75- 300Kg N did not cause significant variation in harvestable shoots nitrogen contents. However, there were large differences in the amounts of nitrogen removed with crop. The NUE of tea decreased as nitrogen fertiliser rates increased and was low in areas where yield responses were low. Such areas need low nitrogen fertiliser application rates to justify return on investment. Quantity of nitrogen removed with crop followed same pattern. On replacement basis, nitrogen removed with crop did not exceed the recommended rate of application (150 kg N/ha/year) at any location or nitrogen rate. Shoot nitrogen contents suggest that soil applied nitrogen may not be responsible for locational variations in yield realisation. Results demonstrate that fertiliser management practices, especially nitrogen rates need to be location specific.

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