Mutrágyahatások kilencéves telepített gyepen

Imre Kádár, Péter Ragályi

Research output: Contribution to journalArticle

Abstract

The effects of diverse N, P and K supply levels and their combinations on the yield, mineral nutrient contents and nutrient uptake of a mixture of eight grass species without legumes, having meadow fescue (Festuca pratensis) as the main component, were studied in the 36th year of a long-term mineral fertilization experiment in 2009. The soil contained 3% humus, 3-5% CaCO 3 and 20-22% clay in the ploughed layer, and was originally supplied moderately with N and K and poorly with P and Zn.The experiment included 4N×4P×4K = 64 treatments × 2 replications = 128 plots. The groundwater was at a depth of 13-15 m and the area was prone to drought. Before the first cut (on 26 May) the area received 119 mm rainfall, with a further 124 mm until the second cut on 12 August. During this 2.5 month period the maximum daily temperature was generally around 30 C or more.The main results were as follows: <ul> <li>-A hay yield of 0.8 t·ha-1 was achieved in the two cuts on the control plot, unfertilized for 36 years, and 6.4 t·ha-1 at the highest NPK rate. The mean hay mass in the autumn cut was 63% of the mean value in the May cut. N and the N×P interaction had the most decisive effect, but no yield loss was caused by the highest PK supplies or N rate.-In the first cut there was a rise in the N, NO3-N, Mn, Zn, Ba and Cu contents of the hay as the N supplies increased, a rise in the P, S and Sr with an increase in P and a rise in K concentration with an increase in K supplies. However, N fertilization caused a reduction in K, P, B and Mo, P fertilization in NO3-N, Zn and Mo, and K fertilization in the cations Ca, Mg, Na, Sr and Cr.-In the first cut the following ranges of element concentrations were observed in the N×P and N×K treatments: N 1.05-1.86%, K 0.55-1.52%, Ca 0.45-0.65%, P 0.13-0.34%, Mg 0.13-0.22%, Na 0.02-0.23%, NO3-N 52-405 mg·kg-1, Zn 12-24 mg·kg-1, Sr 11-23 mg·kg-1, Mo 0.3-2.1 mg·kg-1, Cr 0.2-0.4 mg·kg-1.-The quantities of elements incorporated into the hay at the first cut exhibited the following minimum and maximum values per hectare, depending on the treatments: 5-60 kg N, 7-37 kg K, 2-16 kg Ca, 1-5 kg P and S, 1-4 kg Mg, 0.1-3.4 kg Na, 5-58 g Sr, 7-49 g Zn, 1-2 g Mo. Similar values were recorded for the element contents and element uptake in the second cut.-In the second cut the mean concentrations of the elements were 20-50% higher than in the first cut, due to the smaller yield. N fertilizer led to an increase in the N and NO3-N contents, P fertilizer in the P and Sr, and K fertilizer in the K content. The quantity of other elements was generally reduced by higher NPK rates. The quantities of elements taken up averaged 25-30% of those in the first cut for Na and Ni, 50-70% for K, Ca, Al, S, Cu and Mo, and 70-90% for N, Ca, Mg, Sr, Ba, B and Zn (due to their greater accumulation in aging hay).

Original languageHungarian
Pages (from-to)331-344
Number of pages14
JournalAgrokemia es Talajtan
Volume62
Issue number2
DOIs
Publication statusPublished - Dec 1 2013

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Soil Science

Cite this