AGRONOMIJAS VÄSTIS - Latvijas LauksaimniecÄ«bas universitÄte

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<strong>AGRONOMIJAS</strong> VĒSTIS (Latvian Journal of Agronomy), No.10, LLU, 2008Table 2. Maize DM yield of four hybrids harvested in four different dates in 2005-2006, t ha -1Harvest datesHybridEarlystarFAO-160RM-20FAO-180TangoFAO-210CefranFAO-340On average forharvest dates,2005 (LSD hybrid x harvest date = 1.00) LSD 0.05 = 0.50September 1 12.02 12.09 12.18 11.76 12.01September 10 14.45 14.81 14.37 12.96 14.15September 20 15.75 15.91 15.35 14.54 15.39September 30 14.26 16.37 15.82 14.04 15.12On average for hybrid,LSD 0.05 = 0.50 14.12 14.79 14.43 13.33 X2006 (LSD hybrid x harvest date = 1.15) LSD 0.05 = 0.58September 1 10.00 9.99 9.53 9.14 9.66September 10 11.29 11.29 11.19 10.98 11.19September 20 13.02 13.55 12.93 12.74 13.06September 30 15.00 14.25 14.70 14.17 14.53On average for hybrid,LSD 0.05 = 0.58 12.33 12.27 12.09 11.76 XFrom September 1 to September 20 yield increased by 3.38 t ha -1 in 2005 and by 3.40 t ha -1 in2006. Further yield increase till the end of September was not observed in 2005, but in 2006 yieldincrease continued and on average it was by 1.47 t ha -1 during last decade (Table 2). Harvest timeaffected maize DM yield by 32% in 2005 and even by 48% in 2006. Despite differences inmaturity rating of selected hybrids, substantial hybrid effect (p
<strong>AGRONOMIJAS</strong> VĒSTIS (Latvian Journal of Agronomy), No.10, LLU, 2008Table 3. DM content of maize and proportion of corn-cobs DM yield in the whole plant DM yielddepending on hybrid and harvest date on average during 2005-2006, g kg -1Harvest datesHybridEarlystarFAO-160RM-20FAO-180TangoFAO-210CefranFAO-340On average forharvest dates,DM content (LSD hybrid x harvest date = 18.10) LSD 0.05 = 9.05September 1 225.27 220.02 222.88 192.73 215.23September 10 249.63 251.70 252.33 213.81 241.87September 20 290.55 286.70 291.47 239.87 277.15September 30 327.28 306.59 321.58 253.46 302.23On average for hybrid,LSD 0.05 = 9.05 273.18 266.25 272.06 224.97 XProportion of corn-cobs DM yield in the whole plant DM yield(LSD hybrid x harvest date = 52.58)LSD 0.05 = 26.29September 1 354.23 344.46 407.22 212.67 329.64September 10 433.06 415.28 446.75 286.29 395.34September 20 528.42 510.53 548.42 399.04 496.60September 30 630,21 593.31 602.22 491.34 579.27On average for hybrid,LSD 0.05 = 26.29 486.48 465.89 501.15 347.33 XOther basic quality indicators are NDF (Table 4) and ADF (Fig. 2) content, from which DMI,DDM and NEL are derived. Strong harvest year effect was noticed on content of NDF (53%;p
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