[PDF] Top 20 Rodríguez Adrados, Francisco - Orígenes de La Lírica Griega

... (Except when head-cuts formed, furrow cross-sectional shape did not change substantially after the initial several minutes of flow.) Instead, the net sediment deposition was likely the r[r] ... See full document

... Recent field studies have demonstrated that small concentra- tions of polymers dissolved in irrigation water appreciably reduce soil loss from irrigated furrows and increase net infil- t[r] ... See full document

... and Erosion Control Th e A1883 and A110 treatments reduced erosion equiva- lently, by 84% relative to controls in each irrigation (Table ...1995 erosion losses were sig- nifi cantly greater than ... See full document

... weight polyacrylamide (AN923 from SNF, ...enhance infiltration and control furrow irrigation erosion was compared against PAM in two field ... See full document

... Figure 2 Lab-scale furrow results compared with field test results highlighting the effect of molecular weight on the effectiveness of polyacrylamide, PAM, in controlling erosion-induced[r] ... See full document

... Laboratory-scale furrow results compared with field test results highlighting the effect of molecular weight on the effectiveness of polyacrylamide, PAM, in controlling erosion-induced s[r] ... See full document

... the effect of straight furrow (SF) and meandering furrow (MF) irrigation strategies, as well as inflow rate, on infiltration and hydraulic parameters including advance time, recession time, ... See full document

... In furrow irrigation, where downslope infiltration results in increasingly smaller downstream flows, (the opposite of rain induced rill erosion where streams increase as runoff accumulat[r] ... See full document

... Applying polyacrylamide (PAM) with furrow irrigation water dramatically reduces soil erosion and frequently increases infiltration. We conducted three studies to determine if PAM control[r] ... See full document

... Not Enough PAM Was Applied - Rate of PAM addition mist be based on total irrigation inflow rate, erosion potential for a field, and desired injection concentration.. Losses of PAM Durin[r] ... See full document

... that the reductions in sediment load of the runoff during the third and fourth irrigations (frig. 4) resulted from increases in initial soil water content which increased stability of ag[r] ... See full document

... Straw + whey was the most effective treatment for reducing sediment outflows from both the upper section and the total length, with a reduction in sediment loss of 97 and 96%, respective[r] ... See full document

... (1982) measured average furrow-to- furrow steady-state infiltration rate CV's of 57% (not adjusted for measurement uncertainty) on six furrow sets on 15 fields in southern Idaho.. The av[r] ... See full document

... Mugnozza et al. [17] reported that the use of plastic sheet mulch in agriculture sector is a global phenomenon with an increasing trend. Use of plastic sheet mulch in agriculture is beneficial to soil physical, ... See full document

... The infiltration increase is caused by earthworms piercing the furrow wetted perimeter during the irrigation allowing water to enter and infiltrate from their extensive burrow system.. L[r] ... See full document

... (1992) published the first detailed report of the effects of PAM-treatment of furrow irrigation water on advance, net-infiltration, furrow infiltration rate, runoff rate, runoff amount, [r] ... See full document

... The infiltration under field conditions was inversely ...final infiltration rate were also associated with both the number of irrigations applied and the quality of the water used (Figure ...final ... See full document

... An average of 15 earthworm holes per meter appeared in the furrow wetted perimeter during the blocked furrow tests. Dye injection into stagnant ponded water showed that water was enter[r] ... See full document

... (1996) tested this hypothesis by comparing steady-state infiltration of PAM-treated and control furrows under slightly unsaturated conditions. Unlike the net infiltration and transient s[r] ... See full document

... sampled furrow infl ow streams during WSPAM applica- tion. Furrow stream samples were collected 15 m downstream from the manifold in Irrigation 1, directly from the manifold outlet in Irrigation 3, and 3 m ... See full document