All fertilizer nutrients are not equally mobile in soils. Under aerobic conditions, relatively mobile nutrient such as nitrate moves deeper into soil profile beyond the reach of the active root system. Under anaerobic puddled conditions with water - table close to soil surface , nitrate nitrogen gets transformed into ammonical form and is absorbed on the negatively charged clay particles, thus not able to move freely with water. This reduces losses of deep placed N. Therefore, it is often recommended for a single deep placement of total N in rice. It seems that it could even be practiced in wheat and other upland crops to harness synergy of nutrient - water interaction for greater photosynthetic activity.

we can apply however to avoid losses of nitrogen go for 3 split doses including basal dose