| dc.description.abstract | A study was conducted in the farm of Hajee Mohammad Danesh Science & Technology
University, Dinajpur during November 2006 to March 2007 to evaluate the effects of
liming on chemical properties of wheat field soils and yield of wheat. The soil was sandy
loam having pH 4.85, organic matter 0.96%, total N 0.06%, available P 43.36 pg g soil’,
K 0.18 meq 100 g soil’, available Ca 1.21 meq 100 g soil’, Mg 0.39 meq 100 g soil”
and S 2.72 ug g soil’. There were eight lime treatments viz.T;: Control, T2 : 0.5 t lime
ha’! , 13: 1.0t lime ha’, T4: 1.5 t lime ha’, Ts; : 2.0 t lime ha’!, Tg : 2.5 t lime ha”, T7:
3.0 t lime ha’! and Tg : 3.5 t lime ha’. Dolochun was used as the liming material. The
design of the experiment was Randomized Complete Block Design with three
replications. Every plot received 130.0 kg N, 5.5 kg P, 54.0 kg K, 33.0 kg S, 3.6 kg Zn
and 0.6 kg B ha” from urea, TSP, MoP, gypsum, zinc sulphate (monohydrate) and boric
acid, respectively. Yield and yield components of wheat were recorded at harvest and the
grain and straw were analyzed for P, S, Ca and Mg contents. The post harvest soils were
analyzed for pH, available P, Ca and Mg. The application of different rates of lime to soil
progressively increased pH and availability of P, Ca and Mg in soils. The pH of the post
harvest soils were positively correlated with available Ca and Mg status of soils. The
grain yields of wheat were positively correlated with soil pH, available P, Ca and Mg
contents of soils. Tiller number plant’, spikelets spike”, grains spike", grain and straw
yields were significantly affected by liming. The treatment Ts (2.0 t lime ha’) produced
grain yield of 4659 kg ha’!, which was statistically identical to those found in Ts, T7 and
Ts treatments but higher |to those in T), Tz, T3 & Ty treatments. Liming significantly
increased S and Mg sone emmattons of wheat grain but the concentrations of P and Ca
remained unaffected. Total uptake of P, S, Ca and Mg were significantly increased due
to application of lime which was mainly associated with increased wheat yields. The
results of this experiment showed that liming is necessary for wheat cultivation in the
Ranishankail soil series of Dinajpur. The application of 2.0 t lime ha appears to be
optimum for desired soil pH for wheat (>pH 6.0), increased availability of nutrients and
ultimately increased wheat yield. Further research may be carried out on the effects of
liming on crops in different cropping patterns in farmer’s fields for a definite conclusion. | en_US |
