The effect of mineral fertilizer application on some parameters of growth-production process in temporary grassland
2001
Ilavska, I. | Rataj, D. | Gaborcik, N. | Gonda, L. (Vyskumny Ustav Travnych Porastov a Horskeho Polnohospodarstva, Poprad (Slovak Republic). Vyskumna Stanica)
The effects of N (+PK) fertilizer application on leaf area index (LAI), net assimilation rate (NAR) and dry matter (DM) production of temporary grassland were studied over 4 years. The research was carried out in an extreme climatic region of the Nizke Tatry (The Low Tatras) mountains. A comparison was made between the fertilizer treatments (N90P30K60) and (N180P30K60) and the control without fertilizer application (N0P0K0). During the growing season, the most notable changes were observed for NAR. The maximum NAR values were recorded in the period of cut 1 and this parameter showed a tendency to decrease in the period between cuts 1 and 3. The maximum LAI was found in cut 2 and the minimum one in cut 3 but the differences between the growing periods were not so significant as those in NAP. The fluctuating values of LAI and NAR were reflected in the final DM production, which was also decreasing from cut 1 to cut 3. The fertilizer N (+PK) application was more closely related to LAI (r=0.763++) than to NAR (r=0.447++). The data averaged over the research years showed the 52.9 and 64.3% increase in LAI as well as the 20.7 and 45.6% rise in NAR values for N90 and N180 treatments, respectively in comparison with the control (N0). An analysis of the relationships between LAI, NAR and DM production indicated that LAI was more influential in the primary production (r=0.843++) than NAP (r=0.411++). Averaged over the experimental period, fertilizer application increased the production of DM relatively by 58.3% for N90 treatment and by 69.4% for N180 treatment
Show more [+] Less [-]AGROVOC Keywords
Bibliographic information
This bibliographic record has been provided by Agricultural Knowledge and Innovation Institute