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The effect of nitrogen and sulphur fertilization on tiller formation and grain yield of spring wheat
2005
Siaudinis, G.(Lithuanian Inst. of Agriculture, Akademija, Kedainio reg. (Lithuania))E-mail:sgintaras@lzi.lt | Lazauskas, S.(Lithuanian Inst. of Agriculture, Akademija, Kedainio reg. (Lithuania))E-mail:sigislaz@lzi.lt
In 2003 and 2004, field experiments with spring wheat (Triticum aestivum L.) were carried out at the Lithuanian Institute of Agriculture in Dotnuva, Lithuania. The aim of the study was to evaluate the effect of nitrogen and sulphur fertilizers on tiller formation and grain yield of spring wheat (variety 'Munk'). N and S fertilizers were applied at 3 rates: N (0, 60 and 120 kg haE-1) and S (0, 15 and 30 kgE-1 ha). Both years, N fertilization had a significant effect on tiller formation. At harvest, the total number of tillers was approximately 0.5 tillers higher in the plots with the application of N120. The growing season in 2003 was comparatively dryer, and a significant increase in grain yield was found - up to 60 kg haE-1 of N. Due to higher rainfall in 2004, grain yield was much higher and the highest effect was found with the maximum N supply - 120 kg haE-1. One thousand grain weight was influenced by the year, while fertilizers did not have any significant effect. The impact of S fertilization on the number of tillers and final grain yield was insignificant; nevertheless S fertilization increased the concentration of S in the aboveground plant mass.
Afficher plus [+] Moins [-]Nitrogen, phosphorus and potassium influence on infections by arbuscular mycorrhizal fungi in Dactylis glomerata roots
2005
Druva-Lusite, I.(University of Latvia, Riga (Latvia))E-mail:mycorrhiza@gmail.com | Liepina, L.(University of Latvia, Riga (Latvia))E-mail:ligita@mail.lubi.edu.lv | Skujins, J.(University of Latvia, Riga (Latvia)) | Antonijs, A.(Latvia Univ. of Agriculture, Skriveri, Aizkraukle reg. (Latvia). Skriveri Research Centre)
The aim of this research was to compare effects of fertilization with various ratios of N, P and K (N:P:K) on arbuscular mycorrhizal fungi (AMF) infection in roots of Dactylis glomerata in Ca-carbonate (limed) and non-limed meadow plots at the Research Centre of Skriveri, Latvia University of Agriculture. Dactylis glomerata roots were excavated from variously fertilizer plots, a minimum 3 root samples per plot and analysed for two consecutive years. Arbuscular mycorrhizal fungi infection rates were estimated according to accepted scoring tables used for determination of AMF colonization.
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