4 documents found, page 1 of 1
Avaliação de métodos climatológicos para estimativa da evapotranspiração
Scaloppi, E.J.; Klar, A.E.; Villa Nova, N.A.The majos purposes of this work were to measure the evapotranspiration in a potato field-crop under three soil moisture regimes and to correlate these values with solar radiation data and to those employing Penman's formula. The estimatives obtained by the two methods studied were significantly correlated to the evapotranspiration values measured in the various periods of the plant growth. In the first stage of...
Evapotranspiration estimates in an onion field utilizing class a pan evaporation
Klar, A.E.; Moretti Filho, J.; Simão, S.Water requirement for onion (Baia Periforme Precoce Variety) was studied by means of field experiments in which water was supplied by the furrow-irrigation method. The "class A" pan was used to evaluate the water need or this crop. Four treatments were used in which soil water potential was maintained at a minimum of -0.5; -1.0; -6.0 and -15.0 bars. Soil moisture content was controlled gravimetrically. The resu...
Effects of irrigation and fertilization on yield, number and size of potato tub...
Scalopi, E.J.; Scardua, R.; Klar, A.E.A study was made on the effects of irrigation and fertilization on the yield, number, and size of potato tubers. Irrigation was based on the mean soil moisture tension of 0.3, 0.6, 1.0, 3.0 and 10.0 bars. Fertilizer in 40 kg/ha of N, and K(2)0 and 80 kg/ha of P2Os, being the dosis 1, 40-80-40 kg/ha, of N, P(2)0(5), and K2O, respectively. Better yields were achieved at soil moisture tensions lower than 1.0 bar a...
Determinação da umidade do solo pelo método das pesagens
Klar, A.E.; Villa Nova, N. A.; Marcos, Z. Z.; Cervéllini, A.Soil moisture determinations are of considerable importance to estimate the need for irrigation and to determine the amount of water to apply. There is a constant demand for a method to determine soil moisture content for irrigation purposes that is at one time reliable, rapid and inexpensive. The multiple-weighing method presented in this work was developed independently from the method proposed years ago by P...