Abstract:
The objective of this field experiment was to evaluate the effect
of humic acid application (2.5 kg ha-1 per plot) on yield components
of 18F3 wheat hybrids (Triticum spp.) at four sowing
times (St1, St2, St3 and St4)
on clay soils of Central Anatolian field conditions in a randomized complete
block design with four replications in 1999 and 2001. Genotypes were evaluated
for plant height (PH-cm), spike number (SN-no), spikelet number (NSL-no),
grain number (GN-no) and 1000-Grain weight (TKW-g). Humic acid (HA) decreased
in all yield components in the St2, St3 and St4
dramatically by more than 33.0, 75.0 and 45.0%, respectively. It was observed
that separation among the genotypes on the basis of mean values was better
under normal than under in any stress factor in this region. Comparison
of mean performance under these conditions revealed that the grain number,
plant height and spike number were the most sensitive traits followed
by rest of them. But, mentioned yield components not always sufficient.
They must be supported any kind of soil conditioners such as HA in such
regions. Moreover, correlation coefficients findings are being verified
that sowing times are crucial importance (esp. first time) and it is being
indicated that the most important trait was GN and TKW on the basis of
their relationships with other traits. To be able to get higher wheat
grain yield under Central Anatolian conditions, all sowing procedures
must be done in time, different and soil conditioners (example HA) must
be used and proper agronomical precautions must be taken in time and adequately.
H. Ulukan , 2008. Effect of Soil Applied Humic Acid at Different Sowing Times on Some Yield Components in Wheat (Triticum spp.) Hybrids. International Journal of Botany, 4: 164-175.
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