ENVIRONMENTAL MODIFICATION CAUSED BY PERFORATED TRANSPARENT POLYETHYLENE LOW TUNNELS CULTIVATED WITH LETTUCE

Ciência Rural

Buriol, Galileo Adeli¹  Streck, Nereu Augusto²  Schneider, Flavio Miguel¹  Medeiros, Sandro Luís Petter¹ 

[1] UFSM, Santa Maria;UFSM

关键词: low tunnels;    management;    environment variables;   

DOI  :  10.1590/S0103-84781993000300001

学科分类：农业科学（综合）

来源: Universidade Federal de Santa Maria * Centro de Ciencias Rurais

【 摘 要 】

Environmental modifications caused by low tunnels made of perforated transparent polyethylene were determineted in an area alocated at the Federal University of Santa Maria, RS. The perforation densities were 100, 200, 300 and 400 perforations per square meter, corresponding respectively to 0.78% (T1), 1.57% CT2), 2.35% (T3) and 3.14% (T4) of area perforated. The results indicated that perforation density did not significantly affected solar energy availability. As perforation density increased there was a decrease on the average diurnal air temperature which demonstrated the viability of ventilating low tunnels with perforated plastic. It was also observed that inside the perforated tunnels the averages values for soil, air minimun and diurnal temperatures and air relative humidity were higher than on the external environment.

【 授权许可】

CC BY-NC