Maize hybrid responds differently to various N rates and plant spacing with changing in grain yield and phenological period to refl ect the respond. A fi eld experiment was conducted at Bako research farm in the year 2017 to determine the response of maize phenology and grain yield for various nitrogen fertilizer rates and plan spacing. The experiment was arranged in a Randomized Complete Block Design in factorial combination with three replications. Three plant spacing i.e. 20cm, 30cm and 40cm, with one row spacing of 75cm and six nitrogen rates i.e. 0kg ha-1 , 23kg ha-1 , 46kg ha-1 , 69kg ha-1 , 92kg ha-1 and 115kg ha-1 were assigned to the experimental plot by factorial combinations. The results showed that reduction in plant spacing and nitrogen starvation resulted delaying to attain 50% tasseling and silking while it speeding up maturity period. Maximum grain yield (10,207.8 kilo gram per hectare) obtained under the narrowest plant spacing (20 centimeters) with application of the highest rate of nitrogen (115 kilo gram nitrogen per hectare). This yield result surpassed by 8.9% compared to the standard check. The experiment indicated an increasing trend of grain yield with increasing N rate and decreasing plant spacing, so further increasing of N rates and reducing plant spacing might further increased the grain yield.

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Haricot bean, often known as Boleqe in Ethiopia. It is a major legume crop produced widely all over the world.Depending on the variety, it may adapt to a wide range of environmental conditions, from sea level to almost 3000 meters above sea level. It thrives commonly in warm climates with temperatures ranging from 18 to 24°C. Despite its importance for nutrition and export, haricot bean production in Ethiopia is limited to small regions and small-scale growers, with little or no fertilizer or soil amendments being employed. The responses of the haricot bean varieties to each limitation varied, although they are mostly determined by the environmental conditions. The main bottle neck of haricot bean production is the lack of improved high producing cultivars that suit to each agroecology. The current experiment was carried out on six released haricot bean varieties with half diallel without reciprocal crosses on the field to make F1 hybrids in all possible combinations and with the objective of evaluation of agronomic traits of haricot bean varieties and performing their half diallel cross by using complete block design. An analysis of variance revealed a highly significant difference in yield contributing components among these released varieties at 5% probability level for most of the traits. This suggests that the released haricot bean varieties have a high genetic variation.