Naslov
Influence of economy various factors on the working quality of pneumatic distributors

Autori
Petrač, Božidar ; Banaj, Đuro ; Zmaić, Krunoslav

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), ostalo

Izvornik
Energy efficiency and agricultural engineering / Nicolay, Mihailov - Ruse : University of Rousse Angel Kanchev, 2002, 325-331

Skup
Energy efficiency and agricultural engineering

Mjesto i datum
Bugarska, 04.04.2002. - 06.04.2002

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
umjetna gnojiva ; pneumatički rasipač ; kvaliteta rasipanja
(fertilizing ; pneumatic distributors ; distribution quality)

Sažetak
The working quality of mineral fertilizer distributors depends greatly on the technical level of some of their systems. With pneumatic distributors the process of distribution starts with sowing rollers for mineral fertilizer exclusion. When working with one of the most commonly used pneumatic distributor in the Republic of Croatia, working deviation of a roller expressed by the coefficient of variation varies from 0.90. - 1.93%. Differences in deviation among sowing rollers are bigger, sometimes up to 2.35%. Variation in number of revolutions in range from 5 - 45 per minute does not influence the quantity of excluded mass per a revolution. It is proved by low intensity correlation (r =0.143). Most of granules in NPK fertilizer (8:26:26) are 3.1- 5.0 mm in diametar. Urea is characterized by granules 2-3mm in diameter, whereas granules contained in CAN fertilizer vary in their size considerably. The quality of surface distribution of mineral fertilizers is influenced by wind speed considerably. At the air speed of 1-2 m/s vertically on the distributor working direction 59.37% of distributed fertilizer will be swerved up to 15 cm from the intended site. The rest (40.63%) is swerved up to 75 cm. At the wind speed of 2 - 3 m/s 51.0% distributed fertilizer mass stay within range of 15 cm. If the wind speed is increased to 4.5m/s, the working quality becomes lower. In such conditions only 2.8% fertilizer stay within range of 15 cm, and most of it (66.94%) is diverted some 15.1-30 cm.

Izvorni jezik
Engleski

Znanstvena područja
Šumarstvo

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