The impact of nitrogen fertilizer norm on the indicators of nutrient use for spring barley | Slāpekļa mēslojuma normu ietekme uz augu barības vielu izmantošanās rādītājiem vasaras miežiem
2013
Ruza, A., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture | Kreita, D., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture | Katamadze, M., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture | Skrabule, I., State Priekuli Inst. of Field Crops Breeding, Cesis reg. (Latvia) | Vaivode, A., State Priekuli Inst. of Field Crops Breeding, Cesis reg. (Latvia) | Malecka, S., State Stende Inst. of Cereal Breeding, Dizstende, Talsu reg. (Latvia)
Optimum rates of the nitrogen (N) fertilizer in spring barley Tocada sowings were studied in field trials established at the Research and Study Farm „Peterlauki” of the Latvia University of Agriculture (LLU), State Stende Cereals Breeding Institute and State Priekuli Field Crops Breeding Institute over the period 2008 – 2012. Fertilizer treatments: N0P0K0 – control (unfertilized); PK fertilizer was equal in all N treatments: N0, N30, N60, N90, N120, N150, N180, N210. The increase of yield was obtained by nitrogen fertilizer N90 – 120 following the increase of nitrogen were not effective. The plant nutrient removal with yield depends on the crop yield level and nutrient content in basic products (grain) and by-products (straw). The nitrogen removal is associated with the yield increase as affected by N fertilizer and with the increase of N content in grain and straw. The increase in P2O5 associated almost only with the increase in grain yield. The difference between the minimum and maximum value of K2O removed was more than two times greater. The utilization coefficients of plant nutrients depended, to a great extent, on the meteorological situation in the growing season. On average, the mineral N utilization coefficient was the highest with nitrogen fertilizer rate N90 – N120 – 0.50 – 0.51, keeping constant relationship that utilization coefficient gradually decreases with each succeeding N fertilizer rate. The utilization indices of P2O5 were comparatively small; however the increase in N fertilizer rate resulted in the increase of P2O5 removal.
اظهر المزيد [+] اقل [-]