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An experiment was carried out at the Horticulture Farm of the Bangladesh Agricultural University, Mymensingh during the period from November 2010 to January 2011 to study the effects of cowdung and potassium on growth and yield of Kohlrabi. The experiment consisted of three levels of cowdung (0, 20 and 40 t/ha) and four levels of potassium (0, 20, 50, 80 kg /ha). The experiment was laid out in randomized complete block design with three replications. All the parameters were significantly influenced by application of cowdung and potassium. The highest plant height (44.65 cm), number of leaves per plant (12.11), length of largest leaf (37.54 cm), and breadth of largest leaf (18.66 cm) were obtained from the highest dose of cowdung and potassium applied (40 t cowdung + 80 kg K/ha) while the lowest plant height (33.64 cm), number of leaves (9.01), length of largest leaf (27.94 cm), and breadth of largest leaf (11.00 cm) were obtained from control treatment combination. The highest fresh weight of leaves (49.33 g), fresh weight of knob (328.66 g) and fresh weight of roots (66.55 g) per plant were also recorded under the treatment combination of 40 t cowdung + 80 kg K/ha, while the lowest fresh weight of leaves (22.11 g), fresh weight of knob (136.00 g) and fresh weight of roots (23.33 g) were obtained from control treatment combination. Similarly, the dry weight of leaves (19.34%), knob (15.19%) and roots (32.75%) were highest under the same treatment combination of 40 t cowdung + 80 kg K/ha and the lowest dry weight of leaves (11.71%), dry weight of knob (7.38%) and dry weight of roots (15.29%) were obtained from control treatment combination C 0 K 0 . The marketable yields of knob per plot (7.86 kg) and per hectare (39.58 tons) were also the highest under the treatment combination 40 t cowdung/ha and 80 kg potassium per hectare.

Soil acidity and lower soil fertility are the key issues that constraint higher crop yield in the Old Himalayan Piedmont Plain area of Bangladesh. The study evaluated the effect of lime and manure on yield of crops in a cropping pattern, potato-mungbean-transplanted aman (TA) rice. Experiments were conducted at Agricultural Regional Station (ARS), Bangladesh Agricultural Research Institute (BARI) farm and farmer’s field under Thakurgaon Sadar Upazila, Thakurgoan district, over two consecutive years. Crop varieties were Cardinal for potato, BARI mung6 for mungbean and Bina dhan7 for TA rice. There were nine treatment combinations with three lime levels (0, 1 and 2 t dololime ha-1) and three manure treatments (poultry manure, farm yard manure and control) with three replications. The rate of poultry manure was 3 t ha-1 and that of FYM was 5 t ha-1. Lime was added to the first crop for entire two crop cycles and manures were applied to the first crop of each crop cycle. Application of lime and manure had significant positive effect on the yield of potato and consequently positive residual effects on mungbean and TA rice. An average 45-59% yield benefit over control for the first crop and 41-43% yield benefit for the third crop was observed. Amendment of soil with dololime @ 1 t ha-1 coupled with poultry manure @ 3 t ha-1 or FYM @ 5 t ha-1 could be an efficient practice for achieving higher crop yield due to optimization of soil acidity and nutrient uptake by plants.

Soil acidic conditions and the decline in soil fertility are among the critical factors that constraint higher crop productivity in the Old Himalayan Piedmont Plain (OHPP), Bangladesh. The study was conducted to evaluate the effect of lime and manure on soil fertility, nutrients and yields of wheat, mungbean and rice. Experiments were done at Agricultural Research Station (ARS), Bangladesh Agricultural Research Institute (BARI) farm and farmer field over two consecutive years with the cropping pattern, namely wheat-mungbean-transplanted (T.) aman rice/monsoon rice. The varieties used were Bijoy for wheat, BARI mung6 for mungbean and Bina dhan7 for T. aman rice. There were nine treatment combinations with three lime levels (0, 1 and 2 ton dololime ha-1) and three manure treatments (poultry manure, farmyard manure and no manure) with three replications. The rate of poultry manure was 3 t ha-1 and that of farmyard manure was 5 t ha-1. Nutrients from manure sources were supplemented with chemical fertilizers to adjust recommended dose. Lime was added to the first crop for entire two crop cycles and manures were applied to the first crop of each crop cycle. Soil pH increased by 0.5-1.11 units, the higher values were observed with higher rates of lime application. Soil organic matter (SOM) increased slightly due to manure treatment. Soil phosphorus availability increased, zinc and boron availability decreased, but the potassium and sulphur availability remained almost unchanged after liming. Application of lime and manure had significant positive effect on the yield of wheat, and their positive residual effects on mungbean and T. aman rice. The effect of 1 t lime ha-1 was comparable with that of 2 t lime ha-1. Between two manures, poultry manure performed better than FYM on crop yields. The trend of plant nutrient uptake by wheat, mungbean and rice followed the trend of these crops yield increase, i.e., crops that were able to uptake more nutrients shown higher yields. The treatment combinations with 1 t ha-1 lime and 3 t ha-1 poultry manure produced an average 35-55% yield benefit over control for the first crop (wheat) and 41-43% yield benefit for the third crop (T. aman rice). This study suggests that dololime @ 1 t ha-1 coupled with poultry manure @ 3 t ha-1 or FYM @ 5 t ha-1 would be an efficient practice for better soil acidic condition, soil fertility and productivity of crops in the Himalayan piedmont soil of Bangladesh.