The aim of this research is to optimize growth and development of maize for biomass by selecting maize hybrids to fulfill their productivity potential.The following maize hybrids were the subject of research: Forteza, DM Native, DM Skarb.The greatest height of plants was formed in the interphase period of milk-wax maturity of grain in hybrid Forteza -286.4 cm.In hybrid DM Native the height of plants was -271.2 cm, hybrid DM Skarb -263.6 cm.Weight of one plant of hybrids studied during the maize growing season ranged from 442 g to 760 g.Thus, the largest mass of maize plants was recorded in the milk-wax maturity stage.It was the largest at the hybrid Forteza and amounted to 760 g, that is more than at the hybrid DM Native for 3.4% (26 g) and at the hybrid DM Skarb for 6.6% (50 g).The average crop yield of the hybrid Forteza for the period of research was 55.1 t ha -1 .Hybrids DM Native and DM Skarb provided this indicator at the level of 50.6 and 45.7 t ha -1 respectively.Hybrid Forteza provided a maximum crop yield 55.1 t ha -1 with plant height 286.4 cm, assimilation surface of one plant and a crop 0.59 m 2 ; 42.8 thousand m 2 ha -1 and plant weight 760 g.
Received: January 31st, 2021 ; Accepted: March 28th, 2021 ; Published: May 19th, 2021 ; Correspondence: jelena.pubule@rtu.lv
Received: February 1st, 2021 ; Accepted: May 2nd, 2021 ; Published: May 18th, 2021 ; Correspondence: Zane.Kusnere@rtu.lv
Indoor air disinfection has become particularly relevant recently because of the Covid-19 pandemics. A shielded device for air and surface disinfection with UV radiation and ozone has been developed. It contains 28 low intensity (11 W) UV lamps (254 nm) in a specially designed three-dimensional grid to provide a large flow cross-sectional area and long path for the air particles to be irradiated. The device can be used in medical institutions, veterinary clinics, manufacturing plants, public premises, poultry, and livestock farms. It does not generate air-ions and ozone concentrations do not exceed the allowed 8-hour average values. The large number of UV lamps and powerful fans ensure air disinfection in large rooms in a relatively short time (400 m3 h-1). Simultaneously, the floor surface under the appliance is disinfected. Disinfection efficiency tests demonstrated 99.9999% reduction for Escherichia coli, Staphylococcus aureus and Pseudomonas phage 6 aerosols within a single transfer through the system (10 seconds of treatment). The housing of the device protects from direct UV radiation;therefore, people can be in the room during the operation of the device. © 2021, Eesti Pollumajandusulikool. All rights reserved.
