Potassium fertilization of timothy‐based cut grassland—Effects on herbage yield, mineral composition and critical K concentration on soils with different K status

Lunnan, Tor; Øgaard, Anne Falk; Krogstad, Tore

doi:10.1111/gfs.12341

Cited by 9 publications

(10 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition to cation imbalances in the forage, lush spring grass tends to be low in fibre and high in dry matter (DM) digestibility which accelerates rumen passage and reducing the ruminal absorption of Mg (Suttle 2010). This is further exacerbated by over application of K to grasslands as fertiliser, including from livestock manures (Agricultural Research Council 1980;Bhanugopan et al 2015;Lunnan et al 2018). Excess K + in the soil solution suppresses the absorption of Mg 2+ by plant roots (Elliot 2008).…”

Section: Introductionmentioning

confidence: 99%

Magnesium biofortification of Italian ryegrass (Lolium multiflorum L.) via agronomy and breeding as a potential way to reduce grass tetany in grazing ruminants

et al. 2019

View full text Add to dashboard Cite

Aim Magnesium (Mg) deficiency (known as grass tetany) is a serious metabolic disorder that affects grazing ruminants. We tested whether Mg-fertiliser can increase Mg concentration of Italian ryegrasses (Lolium multiflorum L.) including a cultivar (cv. Bb2067; 'Magnet'), bred to accumulate larger concentrations of Mg. Methods Under controlled environment (CE) conditions, three cultivars (cv. Bb2067, cv. Bb2068, cv. RvP) were grown in low-nutrient compost at six fertiliser rates (0-1500 μM MgCl 2 .6H 2 O). Under field conditions, the three cultivars in the CE condition and cv. Alamo were grown at two sites, and four rates of MgSO 4 fertiliser application rates (0-200 kg ha −1 MgO). Multiple grass cuts were taken over two-years. Results Grass Mg concentration increased with increasing Mg-fertiliser application rates in all cultivars and conditions. Under field conditions, cv. Bb2067 had 11-73% greater grass Mg concentration and smaller forage tetany index (FTI) than other cultivars across the Mg-fertiliser application rates, sites and cuts. Grass dry matter (DM) yield of cv. Bb2067 was significantly (p < 0.05) smaller than cv. Alamo. The effect of Mgfertiliser rate on DM yield was not significant (p ≥ 0.05). Conclusions Biofortification of grass with Mg through breeding and agronomy can improve the forage Mg concentration for grazing ruminants, even in highgrowth spring grass conditions when hypomagnesaemia is most prevalent. Response to agronomic biofortification varied with cultivar, Mg-fertiliser rate,

show abstract

Section: Introductionmentioning

confidence: 99%

Magnesium biofortification of Italian ryegrass (Lolium multiflorum L.) via agronomy and breeding as a potential way to reduce grass tetany in grazing ruminants

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Values of K-AL below 65 mg kg -1 are considered low, values between 66 and 155 are intermediate and those above 155 are considered high. K-HNO 3 values less than 300 mg kg -1 are low, values between 30 and 795 are intermediate and values above 795 are high (Lunnan et al 2017).…”

Section: Methodsmentioning

confidence: 87%

“…The concentrations of K and Cl in the forage are easier to manipulate than those of Na and S (Goff 2014). However, many soil types in the Nordic countries contain rather high levels of plant available K, and grasses tend to take up more K than is needed for normal growth (Lunnan et al 2017). Furthermore, cattle slurry rich in K is often applied at rather high rates throughout the growth period.…”

Section: Introductionmentioning

confidence: 99%

Controlling dietary cation-anion differences in forages by chloride fertilisation

Nesheim

Synnes²,

Steen³

et al. 2020

AFSci

View full text Add to dashboard Cite

Rations with low to negative dietary cation-anion difference (DCAD) given to dairy cows before calving reduce the risk of hypocalcaemia (milk fever). Different strategies for increasing forage DCAD were investigated in field trials in Central and Western Norway. Fertilisation with 70, 140 or 210 kg Cl per hectare as calcium chloride and low supply rates of K reduced DCAD in forage harvested at late developmental stages in spring growth of timothy and meadow fescue. The ideal negative DCAD was only attained on soils very low in plant available K. Timing (spring versus late spring) and source of Cl (CaCl2 versus MgCl2) were of no importance for the result. When pure stands of seven grasses were fertilised in spring either without chloride or with 140 kg chloride per hectare, the lowest values of DCAD after chloride fertilisation were found in perennial ryegrass and reed canary grass. By comparison, cocksfoot had equally high or higher Cl concentrations in its tissues, but accumulated more K, and seemed to be poorly suited for low DCAD forage production. It was concluded that Cl fertilisation is a more efficient means of controlling DCAD than sward species composition.

show abstract

“…Phosphorus and potassium have specific biochemical functions in plants, and fertilization is necessary to ensure herbage yield [62]. The optimum content of P recommended for dairy cattle ranges from 2.4 to 4.0 g.kg-1 [63].…”

Section: Discussionmentioning

confidence: 99%

Changes and Interactions between Grassland Ecosystem Soil and Plant Properties under Long-Term Mineral Fertilization

et al. 2020

View full text Add to dashboard Cite

Grasslands intensification by use of mineral fertilization has contributed substantially to the increase in forage production. Intensification, however, can degrade the other beneficial functions or soil properties. The effects of mineral fertilization on soil and plant chemical qualities of a permanent wet grassland (Festucetum pratense association) were investigated in Slovakia. The grassland was treated using 3 different N, P, and K rates of mineral fertilizers in kg. ha−1. yr−1 plus the Control (0NPK) almost over 60-year period (1961–2017). The N, P, and K rates in low NPK treatment (LNPK) were N50, P15.4, and K 41.5, in the medium NPK treatment (MNPK) were N100, P30.8, and K83, and in the high NPK treatment (HNPK) were N200, P 61.6, and K 166, respectively. Overall, soil variables (pH, soil organic carbon, plant-available K) showed the most significant changes. A more balanced development was observed in case of soil total nitrogen, C:N ratio, and plant-available P. ANOVA revealed a significant effect between treatments only on plant-available P. In the case of plant functional group development, long-term mineral addition significantly disfavors legumes and forbs. However, analyses of the botanical composition over the last 5 years showed that legume cover significantly differs only in the HNPK treatment. Plant C:P, N:P, and N:K ratios were significantly reduced when fertilizers were added. In terms of grasslands yields, the highest biomass and content of macronutrients were obtained under the HNPK rates. However, with regard to the quality and quantity of the soil organic matter, the most appropriate treatment has been with the MNPK rates. Our findings demonstrate that medium fertilization seems to be an acceptable compromise to meet both productivity and environmental aspects and to connect ecological benefits with social benefits in the long term.

show abstract

Potassium fertilization of timothy‐based cut grassland—Effects on herbage yield, mineral composition and critical K concentration on soils with different K status

Cited by 9 publications

References 31 publications

Magnesium biofortification of Italian ryegrass (Lolium multiflorum L.) via agronomy and breeding as a potential way to reduce grass tetany in grazing ruminants

Magnesium biofortification of Italian ryegrass (Lolium multiflorum L.) via agronomy and breeding as a potential way to reduce grass tetany in grazing ruminants

Controlling dietary cation-anion differences in forages by chloride fertilisation

Changes and Interactions between Grassland Ecosystem Soil and Plant Properties under Long-Term Mineral Fertilization

Contact Info

Product

Resources

About