EFFECTS OF POTASSIUM FERTILIZER AND FALL HARVESTS ON ALFALFA GROWN ON THE EASTERN CANADIAN PRAIRIES

1983 ◽  
Vol 63 (2) ◽  
pp. 211-219 ◽  
Author(s):  
L. D. BAILEY
Keyword(s):  
Medicago Sativa ◽  
Maximum Yield ◽  
N Fixation ◽  
Potassium Fertilizer ◽  
Canadian Prairies ◽  
Exchangeable K ◽  
K Fertilizer ◽  
Medicago Sativa L ◽  
June July ◽  
Annual Application

The objectives of the study were to determine the effect of soil and fertilizer potassium (K) on the yield and chemical composition of alfalfa (Medicago sativa L.), and whether fall harvesting (October) had detrimental effects on alfalfa grown under the relatively cool and short growing season of the Eastern Canadian Prairies. Vernal alfalfa was sown on five soils, two high and three low in amounts of exchangeable K. Three harvests were taken each year in June, July, and October at the full bud stage. The soils were rated on their potential potassium supplying power (PKSP). The effect of fertilizer K on increasing the availability of soil K and on the K and N composition of the forage were measured. The PKSP of the soils was not related to initial levels of exchangeable K. However, soils with low exchangeable K and low PKSP required an annual application of 200 kg K/ha to produce maximum yield. There was response to K fertilizer on only one of the soils with high exchangeable K, and then only to the first increment. At maximum yield on all soils, the K and N contents of the forage at full bud were greater than 2.0% and 3.0%, respectively. When the K content of the forage was less than 1%, severe winter injury occurred and yields decreased. With adequate K fertilizer fall harvesting had no detrimental effects on alfalfa production. Comparisons of the K and N contents of the forage indicates that increasing the concentration of K available to the crop may have a beneficial effect on N-fixation. Key words: Medicago sativa L. ’Vernal’, potential potassium supplying power, nitrogen fixation

ALFALFA VARIETIES ZONED IN THE CENTRAL CHERNOZEM ZONE OF THE RUSSIAN FEDERATION

2020 ◽  
Author(s):  
Galina Stepanova
Keyword(s):  
Medicago Sativa ◽  
Dry Matter ◽  
Maximum Yield ◽  
The State ◽  
Average Yield ◽  
State Register ◽  
Independent Evaluation ◽  
Medicago Sativa L ◽  
Alfalfa Varieties ◽  
Central Chernozem

The article describes the main morphological and biological features of alfalfa varieties included in the State register of breeding achievements approved for use in the Central Chernozem zone of Russia. A total of 32 alfalfa varieties are included in the State register. This is 9 varieties of blue alfalfa (Medicago sativa L. subsp. Sativa) of domestic selection and 8 foreign, 11 varieties of variable alfalfa (Medicago sativa L. nothosubsp. varia (Martyn) Arcang.) domestic selection and 1 variety of foreign and 3 varieties of yellow alfalfa (Medicago sativa L. subsp. falcata (L.) Arcang.). It shows the average and maximum yield of varieties determined in the process of state variety testing, as well as independent evaluation in research institutions in the region. Varieties of blue alfalfa of domestic selection Kevsala, Elena, Satellite, Vavilovskaya Yubileynaya were the most productive. The average yield of dry matter of these varieties reaches 8.4–9.2 t/ha, the maximum — 15.3–17.7 t/ha. Alfalfa varieties Timbale and Galaxy were the most productive among foreign varieties: the average yield of dry matter was 8.1 and 8.3 t/ha, the maximum – 15.5 and 17.2 t/ha. Varieties of alfalfa variable Vitalina and Vela provided an average yield of dry matter of 7.6 and 9.0 t/ha, the maximum yield reached 15.4 and 18.1 t/ha.

Nitrogen fixation by subterranean clover (Trifolium subterraneum L.) growing in pure culture and in mixtures with varying densities of lucerne (Medicago sativa L.) or phalaris (Phalaris aquatica L.)

1999 ◽  
Vol 50 (6) ◽  
pp. 1047 ◽  
Author(s):  
B. S. Dear ◽  
M. B. Peoples ◽  
P. S. Cocks ◽  
A. D. Swan ◽  
A. B. Smith
Keyword(s):  
Medicago Sativa ◽  
N2 Fixation ◽  
Pure Culture ◽  
Subterranean Clover ◽  
Trifolium Subterraneum ◽  
Shoot Biomass ◽  
N Fixation ◽  
Mineral N ◽  
Phalaris Aquatica ◽  
Medicago Sativa L

The proportions of biologically fixed (Pfix) plant nitrogen (N) and the total amounts of N2 fixed by subterranean clover (Trifolium subterraneum L.) growing in pure culture and in mixtures with different densities (5, 10, 20, or 40plants/m2) of newly sown phalaris (Phalaris aquatica L.) or lucerne (Medicago sativa L.) were followed over 3 years in a field study using the 15N natural abundance technique. The amount of fixed N in subterranean clover was linearly related to shoot biomass. Over the 3-year period, subterranean clover fixed 23–34 kg N/t shoot biomass compared with 17–29 kg N/t shoot biomass in lucerne. Based on above-ground biomass, pure subterranean clover fixed 314 kg N/ha over the 3 years compared with 420–510 kg N/ha by lucerne–clover mixtures and 143–177 kg N/ha by phalaris–clover mixtures. The superior N2 fixation by the lucerneŒsubterranean clover mixtures was due to the N fixed by the lucerne and the presence of a higher subterranean clover biomass relative to that occurring in the adjacent phalaris plots. In the first year, 92% of subterranean clover shoot N was derived from fixation compared with only 59% of lucerne. The reliance of clover upon fixed N2 remained high (73–95%) throughout the 3 years in all swards, except in pure subterranean clover and lucerne in August 1996 (56 and 64%, respectively). Subterranean clover usually fixed a higher proportion of its N when grown in mixtures with phalaris than with lucerne. The calculated Pfix values for lucerne (47–61% in 1995 and 39–52% in 1996) were consistently lower than in subterranean clover and tended to increase with lucerne density. Although lucerne derived a lower proportion of its N from fixation than subterranean clover, its tissue N concentration was consistently higher, indicating it was effective at scavenging soil mineral N. It was concluded that including lucerne in wheat-belt pastures will increase inputs of fixed N. Although lucerne decreased subterranean clover biomass, it maintained or raised Pfix values compared with pure subterranean clover swards. The presence of phalaris maintained a high dependence on N2 fixation by subterranean clover, but overall these swards fixed less N due to the lower clover herbage yields. Perennial and annual legumes appear compatible if sown in a mix and can contribute more N2 to the system than where the annual is sown alone or with a perennial grass. These findings suggest that increases in the amount of N2 fixed can be achieved through different legume combinations without interfering greatly with the N fixation process. Different combinations may also result in more efficient use of fixed N2 through reduced leaching. Further work looking at combinations of annuals possibly with different maturity times, different annual and perennial legume combinations, and pure combinations of perennial (e.g. lucerne) could be investigated with the aim of maximising N2 fixation and use. Grazing management to encourage clover production in mixtures with phalaris will be necessary before the potential of subterranean clover to contribute fixed N2 in these swards is fully realised.

PASTURE PRODUCTIVITY OF TWO GRASS–ALFALFA MIXTURES IN NORTHEASTERN SASKATCHEWAN

1965 ◽  
Vol 45 (2) ◽  
pp. 162-168 ◽  
Author(s):  
D. A. Cooke ◽  
S. E. Beacom ◽  
W. K. Dawley
Keyword(s):  
Medicago Sativa ◽  
Dry Matter ◽  
Bromus Inermis ◽  
Beef Production ◽  
Rotational Grazing ◽  
Standard Mixture ◽  
Intermediate Wheatgrass ◽  
Medicago Sativa L ◽  
Annual Application ◽  
Average Yearly Increase

Two grass–alfalfa mixtures were compared for seven consecutive years when continuously and when rotationally grazed by yearling Hereford steers. The productivity of rotationally grazed pastures as affected by annual application of fertilizers was also determined. Intermediate wheatgrass (Agropyron intermedium L.) and alfalfa (Medicago sativa L.) compared favorably with the standard mixture of bromegrass (Bromus inermis L.) and alfalfa for pasture purposes. Production of dry matter ranged from approximately 2.5 to 0.5 tons per acre in the first and seventh year respectively. Precipitation in these two years was 20.7 and 7.7 in. respectively. Rotational grazing did not increase beef production. Fertilization of bromegrass–alfalfa with 20 lb of N per acre and with 20 lb of N + 40 lb of P2O5 per acre resulted in average yearly increase of 18 and 32 lb of beef per acre respectively. Fertilization of intermediate wheatgrass– alfalfa resulted in comparable increase of 1 and 26 lb of beef per acre respectively.

Evaluation of Rhizobium inoculant formulations for alfalfa yield and N fixation

2007 ◽  
Vol 87 (2) ◽  
pp. 267-272 ◽  
Author(s):  
J. Diane Knight
Keyword(s):  
High Risk ◽  
Medicago Sativa ◽  
Sinorhizobium Meliloti ◽  
The Other ◽  
N Fixation ◽  
Biological N Fixation ◽  
Small Seed ◽  
Alfalfa Seed ◽  
Medicago Sativa L

Because of its small seed size, alfalfa (Medicago sativa L.) typically is seeded at a shallow depth, putting Rhizobium inoculated onto the seed coat at a high risk of desiccation. Granular inoculants may provide a superior delivery formulation for Rhizobium because the inoculant can be placed deeper in the soil than the seed, where it is protected from desiccation. Sinorhizobium meliloti cv. Beaver delivered as (1) pre-inoculated alfalfa seed from the inoculant manufacturer, (2) commercial peat-based, self-sticking inoculant applied on-site, and (3) granular inoculant placed with the seed or (4) banded below and to the side of the seed was evaluated against uninoculated alfalfa controls at three field sites in Saskatchewan. Overall, alfalfa inoculated with the granular formulation placed below and to the side of the alfalfa seed was among the highest biomass producer in the establishment year, although it did not exhibit superior nodulation or biological N fixation compared with the other treatments. Any advantage conferred by the granular inoculant in the establishment year did not persist through the first and second production years. Under the conditions of this study, the delivery formulation had no long-term affect on alfalfa productivity, nodulation and biological N fixation. Furthermore, none of the inoculant treatments were consistently superior to the uninoculated controls. Key words: Alfalfa, granular inoculant, peat inoculant, pre-inoculated seed, Medicago sativa L., Sinorhizobium meliloti

Effects of annual and biennial applications of phosphorus and potassium fertilizer and farmyard manure on yields of potato tubers, on nutrient uptake and on soil properties

1980 ◽  
Vol 94 (3) ◽  
pp. 533-538 ◽  
Author(s):  
R. C. Sharma ◽  
J. S. Grewal ◽  
M. Singh
Keyword(s):  
Farmyard Manure ◽  
P Uptake ◽  
Residual Effects ◽  
Available P ◽  
Potassium Fertilizer ◽  
K Uptake ◽  
Total N ◽  
Exchangeable K ◽  
K Fertilizer ◽  
Better Than

SummaryA long-term manurial experiment on potatoes was initiated in 1970 on the acidic brown hill soil of Simla to study the effects of fertilizers supplying per hectare: 44 kg P (P44); 44 kg P and 125 K (P44K125) and 88 kg P with 125 kg (P88K125) and of farmyard manure (FYM) supplying 44 kg P/ha applied annually and biennially. The potatoes gave large responses to all the manures. The annual or biennial effects of FYM measured in years of application were as great as that of P and K fertilizer in increasing tuber yield and K uptake by tubers but FYM increased P uptake more than fertilizers did. FYM applied each year gave largest uptake of P. P88 treatment was not better than P44 treatment. The residual effects of the manures on yield were measured in years when the treatments were not applied; the residual effects of FYM were higher than those of fertilizers. Mean residual effects of the treatments on P uptake were 46% and 51% of their annual or biennial effects respectively. About 90% of P added to the soil was not taken up by the crops and was present in the forms of aluminium-bound P, iron-bound P and calcium-bound P in this descending order. The residual effects of the treatments on K uptake were about 84% of their annual or biennial effects. About 60% of K applied to the soil was not taken up by the crops and most was present in exchangeable form. Annual applications of all the manures were better than their biennial applications indicating that residual effects built up from three applications over 6 years were too small to sustain yields.Soil analyses made 6 years after the start of the experiment showed that FYM was a better source of P than single superphosphate in increasing soil available P. FYM also increased soil exchangeable K more than the K fertilizer did. The highest increase in available P and K in soil was from annual applications of manures. Biennial applications of P as superphosphate or FYM resulted in P accumulating in the soil, while biennial K fertilizer dressings did not increase exchangeable K; however, biennial FYM did increase exchangeable K. Using P alone reduced soil available K. FYM increased pH, organic carbon and total N in soils while P and K fertilizer increased only the pH.

scholarly journals Production process and the yield of hay Medicago sativa l. of the first year of life in rice crop rotation

2019 ◽  
pp. 19-22
Author(s):  
Elvira Batyrevna Dedova ◽  
Galina Nagashevna Konieva ◽  
Bairta Borisovna Erdneeva
Keyword(s):  
Medicago Sativa ◽  
Crop Rotation ◽  
Maximum Yield ◽  
Rice Crop ◽  
First Year ◽  
Seeding Rate ◽  
Residual Moisture ◽  
Parabolic Form ◽  
Medicago Sativa L ◽  
First Year Of Life

The predecessors of rice, combined with their characteristic agricultural machinery, restore soil fertility, increase the yield of rice, provide forage products and as a result determine the productivity of the entire rotation of the crop rotation. In the rice crop rotations of the Sarpinsky lowland, studies are conducted to study the yield of alfalfa of the 1st year of life in the rice crop rotation on the reserves of productive moisture remaining after rice at different seeding rates. The soil cover of rice cheques is represented by brown semi-desert medium-and heavy-loamy soils in combination with saline. In the first year of the life of alfalfa (Medicago sativa L.) two residues of above-ground mass were obtained on residual moisture reserves (250–320 mm) after rice. The maximum yield of hay for two mowing 2.86-3.62 t/ha was obtained in the version with a seeding rate of 9.0 million pieces /ha, which is 0.86-1.21 t/ha more than the control option (5.0 million pcs/ha). It has been developed a dynamic model based on the yield of hay from alfalfa seeding rate seed having parabolic form with a maximum on top with a seeding rate of 9.0 million pcs/ha.

Estimación de biomasa aérea de forrajes de invierno bajo riego a través de un dron

2019 ◽  
Vol 12 (4) ◽  
Author(s):  
Francisco Gavi Reyes ◽  
César Botello-Aguillón ◽  
Leonardo Tijerina-Chávez ◽  
Arturo Galvis-Spíndola ◽  
Rodrigo Roblero-Hidalgo
Keyword(s):  
Medicago Sativa ◽  
Avena Sativa ◽  
Medicago Sativa L

E Objetivo: Desarrollar un procedimiento para estimar biomasa con imágenes digitales captadas desde un dron y modelación 3D (ID-Dron-3D) aplicable en alfalfa (Medicago sativa L.) y avena forrajera (Avena sativa L.). Diseño/metodología/aproximación: Con una cámara digital acoplada al dron se obtuvieron imágenes antes de la cosecha de los cultivos, que fueron procesadas con software para luego estimar volumen de biomasa. En cada cultivo se midió altura de la planta y área cosechada, volumen aparente y real de biomasa, y peso de biomasa fresca y seca. Resultados: Con base en el análisis de regresión se obtuvieron modelos lineales a una p<0.05 para predecir: biomasa fresca en avena (R2=0.70) y alfalfa (R2 =0.47); y biomasa seca en avena (R2=0.78) y en alfalfa (R2=0.31) mediante ID-Dron-3D. Limitaciones del estudio/implicaciones: Considerando las R2 de los modelos obtenidos, los resultados en la avena forrajera fueron mejores, respecto a los detectados en alfalfa, lo cual se puede deber a la mayor variabilidad de la cobertura vegetal, ya que, en algunas unidades de muestreo, las plantas de alfalfa no cubrían completamente el suelo. Hallazgos/conclusiones: El rendimiento de biomasa fresca y seca de ambos cultivos se correlacionó significativamente con su respectivo volumen aparente estimado con imágenes digitales tomadas desde un dron y su procesamiento 3D (ID-Dron-3D).

ALFALFA (Medicago sativa L.) CULTIVADA EN CAMPECHE, MÉXICO Y SU INTEGRACIÓN LOCAL EN LA ALIMENTACIÓN DE CORDEROS EN CONFINAMIENTO

2018 ◽  
Vol 11 (9) ◽  
Author(s):  
CC. Castillo-Águilar
Keyword(s):  
Medicago Sativa ◽  
Pennisetum Purpureum ◽  
Medicago Sativa L

Se comparó el uso de diferentes dietas con base en heno de alfalfa cultivada (Medicago sativa L.) en Campeche y su relación con un concentrado comercial y pasto Taiwán (Pennisetum purpureum), T1=concentrado comercial, T2=T1+heno de alfalfa, T3=T1+pasto Taiwán, T4=heno de alfalfa. Se evaluó el comportamiento productivo y metabólico de corderos en sistema intensivo utilizando 20 corderos machos con encaste de Pelibuey, Dorper y Black Belly de 12.5±1 kg de peso vivo (PV). Se midió el consumo de materia seca total (CMS), la ganancia diaria de peso (GDP), la conversión alimenticia (CA), y la digestibilidad in situ de la materia seca (DISMS). También fueron evaluados el pH, nitrógeno amoniacal (NH3) y la concentración de ácidos grasos volátiles (AGV) en líquido ruminal. La mejor GDP en gramos por día, de 234 g (p?0.05) se obtuvo en el T2; en contraste, el T3 mostró la menor GDP. La dieta que incluyó la mezcla de heno de alfalfa y concentrado mejoró significativamente las condiciones de las variables pH, NH3 y AGV (p?0.05).

Szennyvíziszappal kezelt Medicago sativa L. növekedésének és rizoszféra tulajdonságainak monitorozása modellkísérletben

2008 ◽  
Vol 57 (1) ◽  
pp. 113-132 ◽  
Author(s):  
Attila Palágyi ◽  
Hamuda Hosam E. A. F. Bayoumi ◽  
Nikoletta Tóth ◽  
Mihály Kecskés
Keyword(s):  
Medicago Sativa ◽  
Medicago Sativa L

A szennyvíziszappal kezelt talajok minőségének meghatározásához elengedhetetlen a biológiai mutatók jellemzése. Jelen tanulmány célja az volt, hogy modellkísérlet segítségével megvizsgáljuk a talajokhoz (barna erdőtalaj és réti csernozjom) különböző arányban (0, 20, 40, 60 és 100% iszap:talaj) hozzáadott szennyvíziszap hatását a talaj pH-értékére, nedvességtartalmára és légzésére, valamint termőképességére (növényi szárazanyag-tartalom), enzimatikus tulajdonságaira és az ott élő mikrobiális közösségekre.Modellkísérletben, eltérő arányú iszap/talaj keveréken termesztettünk lucernát 63 napon keresztül. Mértük a relatív növényi szárazanyag-tartalmat, valamint a talaj pH-értékének és nedvességtartalmának a változását. Megvizsgáltuk továbbá a rizoszféra mikrobiális összetételét (aerob heterotróf baktériumok, aerob heterotróf spórások, cellulózbontók és foszfátoldók, fuorescens Pseudomonas ok, Sinorhizo-biummeliloti , aktinomicéták, fonalas gombák, valamint élesztők csíraszámát) és a különböző enzimek (FDA, dehidrogenáz, kataláz, ureáz, proteáz, foszfatáz, β-glükozidáz és aril-szulfatáz) aktivitását. Ugyancsak meghatároztuk a kibocsátott CO 2 alapján a talajlégzés mértékét.Eredményeink azt mutatják, hogy a szennyvíziszap hozzáadásával a talaj hosszabb ideig megőrizte nedvességtartalmát, mint a kontroll (100% talaj/0% iszap), valamint emelkedett a talaj pH-értéke is. A növények egészséges fejlődésén és növekedésén kívül, a legnagyobb növényi szárazanyag-tömeget is a nagy szennyvíziszap tartalmú minták (60–100% iszap) esetében mértük. A minták szennyvíziszap- koncentrációjának emelésével jelentősen nőtt a tenyészthető mikrobiális populációk sűrűsége is a lucerna rizoszférájában.A leggyakrabban előforduló baktériumok a következő genus okhoz tartoztak: Acinetobacter, Azotobacter, Bacillus, Brevundimonas, Cellulomonas, Chromo-bacterium, Corynebacterium, Enterobacter, Escherichia, Flavobacterium, Klebsiella, Micrococcus, Proteus, Pseudomonas, Sinorhizobium, Serratia, Stenotrophomonas, Streptococcus, Streptomyces és Zooglea . A legmagasabb fonalasgomba-populációkat a barna erdőtalajban mértük, mindkét (hódmezővásárhelyi és nyíregyházi) szennyvíziszap jelenlétében. A leggyakoribb izolátumok az Altenaria, Aspergillus, Cephalosporium, Cladosporium, Fusarium, Geotrichum, Mucor, Penicillium, Rhizopusés _s

Effect of microelement loads on alfalfa (Medicago sativa L.) grown on a calcareous sandy soil

2012 ◽  
Vol 61 (2) ◽  
pp. 345-362
Author(s):  
Imre Kádár ◽  
Márk Rékási
Keyword(s):  
Medicago Sativa ◽  
Sandy Soil ◽  
Medicago Sativa L

Karbonátos Duna–Tisza közi homoktalajon vizsgáltuk a 0, 30, 90 és 270 kg·ha-1 mikroelem-terhelés hatását a lucernára a 2004 és 2008 közötti időszakban. A mikroelemek sóit egy ízben, a kísérlet indulásakor, 1995 tavaszán szórtuk ki Cr2(SO4)3, K2Cr2O7, CuSO4, Pb(NO3)2, Na2SeO3 és ZnSO4 formájában. A 6 elem×4 terhelési szint = 24 kezelés×3 ismétlés = 72 parcellát jelentett, 7×5 = 35 m2-es parcellákkal. A termőhely a homoktalajokra jellemzően rossz vízgazdálkodású, aszályérzékeny és az NPK főbb tápelemekkel gyengén ellátott. A szántott réteg 0,7–1,0% humuszt, 2–3% CaCO3-ot tartalmaz, a talajvíz 5–10 m mélyen található. Alaptrágyaként 100– 100–100 kg·ha-1 N, P2O5 és K2O hatóanyagot alkalmazunk évente az egész kísérletben. A lucerna telepítése előtt 2003 őszén 400 kg·ha-1 P2O5- és 600 kg·ha-1 K2O-adaggal előretrágyázást végeztünk. A N-trágyát továbbra is évente adagoltuk megosztva (ősszel és tavasszal fele-fele arányban). A főbb eredmények: – A talaj kielégítő NPK kínálata és a kedvező csapadékviszonyok hozzájárultak ahhoz, hogy a lucerna 5 éven át kielégítően fejlődött és összesen 45 t·ha-1 légszáraz szénatermést adott. A legkisebb hozamot (5,5 t·ha-1) az 1. év adta, a legnagyobb hozamokat (11, illetve 10 t·ha-1 ) a 2. és 3. évben kaptuk A kísérlet 10–14. éveiben a Cr(III)- és a Cr(VI)-szennyezés érdemi dúsulást nem okozott a lucerna hajtásában. A kontrolltalajon mért 0,1–0,5 mg·kg-1 Cr-koncentráció 1–2 mg·kg-1 értékre emelkedett átlagosan a szennyezett kezelésekben. Az elöregedő lucernában az évekkel a Cr-tartalom mérséklődött. A Cr(III) ion alapvetően megkötődött a feltalajban, míg a Cr(VI) ion döntően a 2–3 m-es talajmélységbe mosódott. – Az ólom és a réz a szántott rétegben maradt. A kontrolltalajon mért 0,2–0,4 mg·kg-1 Pb-koncentráció 0,5–1,4 mg·kg-1-ra emelkedett a szénában, szennyezett talajon, az évek átlagában. A réz 5–7-ről 9–10 mg·kg-1-ra nőtt a maximális Cu-terheléssel, az évek átlagait tekintve. A szelén extrém módon, átlagosan 3 nagyságrenddel dúsult a szénában. A kontrolltalajon az 1 mg·kg-1 méréshatár alatt maradt, míg a maximális terheléssel 200–400 mg·kg-1 értékre ugrott. A széna takarmányozási célra alkalmatlanná vált. Kevésbé szennyezett talajon a lucerna fitoremediációs célokra alkalmas lehet. Az 5 év alatt a 45,5 t·ha-1 szénatermésbe erősen szennyezett kezelésben 6–12 kg·ha-1 Se akkumulálódott. A 10–15 évvel korábban adott Na-szelenit alapvetően Ca-szelenáttá alakulhatott ezen a karbonátos, jól szellőzött talajon és 4 m mélységig kimosódott. A cink mérsékelt mobilitást mutatott. A kontroll-talajon mért 18–21 mg·kg-1 Zn-tartalom a 270 kg·ha-1 Zn-adaggal 25–31 mg·kg-1-ra emelkedett az évek átlagában. A Zn-terhelés tulajdonképpen a lucerna rejtett Zn-hiányát szüntette meg. – Az 5 év alatt a lucerna számításaink szerint 1580 kg N, 1177 kg Ca, 744 kg K (893 kg K2O), 145 kg Mg, 140 kg S, 133 kg P (305 kg P2O5); 0,1–12,6 kg Se; 2–3 kg Na; 0,8–1,3 kg Zn; 278–427 g Cu; 14–39 g Cr és 15–35 g Pb elemet épített be a 45 t föld feletti hajtásába. A felvett nitrogén több mint 2/3-a a levegőből származhatott. A talajkimerülés kérdése felmerül a tartós lucernatermesztés során. A K-hiányos termőhelyeken elsősorban a K, a kilúgzott talajokon a Ca pótlásáról gondoskodni szükséges a telepítés előtt. Hasonló viszonyokat feltételezve elvileg az Pb fitoremediációja 65 ezer, a Cr 50 ezer, a Cu 7560, a Zn 2885, a Se 105 ilyen „lucernaévet” igényelne. A lucerna tehát elvileg alkalmas lehet a szelénnel mérsékelten szennyezett talaj tisztítására. – Az 5 m mélységig végzett mintavételek adatai szerint 2006-ban (a kísérlet 12. éve után) a Cr(VI) kimosódási zónája meghaladta a 3 m, míg a Se kilúgzása a 4 m mélységet a 270 kg·ha-1 kezelésekben. A Cr(III), Pb, Zn és Cu elemeknél a vertikális elmozdulás nem volt igazolható. – Korábbi adatainkat és a lucerna élettani optimumait is figyelembe véve az 1 t tervezhető szénatermés úgynevezett fajlagos elemtartalmának irányszámait 35-7-25-30-5 = N-P2O5-K2O-CaO-MgO kg·t-1 értékben javasoljuk a hazai szaktanácsadás számára bevezetni.

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