Effects of sodium sulphate and potassium chloride fertilizers on the nutritive value of timothy grown on different soils

Abstract

Third harvest samples from a pot experiment were analysed to study the effects of sodium (Na) (0, 200 and 400 mg dm-3 of soil in a single application as Na2SO4 . 10H2O) and potassium (K) application (0, 100 and 200 mg dm-3 applied at each harvest as KCl) on the nutritive value of timothy grown on three different soil types (clay, loam and organogenic soil). The effects of fertilization on concentrations of crude protein, neutral detergent fibre (NDF) and non-structural carbohydrates, although statistically significant, were relatively minor in absolute terms. Na applications increased and K applications decreased sulphur and phosphorus concentrations, the magnitude of which was dependent on soil type. The increase in sulphur concentration can be attributed to sulphate in Na-fertilizer. The effects of fertilizers on in vitro organic matter digestibility and the potential extent of dry matter (DM) and NDF digestibility were small. Digestion kinetic parameters estimated from fermentative gas production measured using a fully automated system were used in a rumen simulation model to estimate digestibility. Total gas volume and the rate of gas production from the rapidly digestible fraction were negatively correlated with timothy S and N concentrations. Na application had no effect, but K application increased true rumen DM digestibility, the effect being most profound on organogenic soil. The results suggest that Na application does not elicit substantial positive effects on the nutritive value of timothy which has often been reported for perennial ryegrass, but K application can improve the nutritive value of timothy grown on K deficient soil.;

Prediction of legume silage digestibility from various laboratory methods

“…The rate and extent of gas production from the samples was measured using a computerized in vitro system. A description of the method applied is given by Huhtanen et al. (2000), with the exception that in the present study, fibre residues of the samples, extracted with NDF (sample size of 0·5 g), were used in the incubation.…”

Surface Water Intrusion, Land Use Impacts, and Bacterial Community Composition in Shallow Groundwater Wells Supplying Potable Water in Sparsely Populated Areas of a Boreal Region

“…“Total length of nearby roads” was positively correlated with N tot , Cl − , and Na, the first of which may originate from vehicle emissions and the latter two from road salt ( 23 , 89 ). “Total nearby field area” was positively correlated with Na (0.54), UV 254 absorbance of unfiltered water (0.54), N tot (0.52), Cl − (0.50), K (0.48), NO 2 − -N (0.42), and (NO 3 − +NO 2 − )-N (0.40), many of which may be linked to fertilizer use ( 90 – 92 ). Roads and fields were not correlated with microbial data.…”