Compared Four Tillage Methods on Some Soil Physical Properties and Yield of Berseem clover (Trifolium alexandrinum) in the Second Crop in paddy fields

Soil tillage is an important element of soil management. Tillage type implement depends on factors, such as soil structure, aggregate stability, texture, crop rotation, erosion potential, moisture conditions and time of cultivation. This experiment was carried out with four treatments with three replications as a randomized complete block design. The treatments were tillage with moldboardplough plus rotivator (T1), twice crossover tillage with moldboard plough (T2), no tillage (T3) and once tillage with moldboardplough (T4). Berseem clover was selected as the second cropping production. Soil samples were taken and yield of production was determined after six month. The results showed that mean weight diameter (MWD), geometric mean diameter (GMD), yield of production, penetration resistance, bulk density, porosity and aggregate size in different tillage methods had significant differences. Compare mean showed the minimum of yield and the maximum of MWD, GMD, penetration resistance and bulk density were all related to no tillage treatment, while the maximum yield obtained from T1 treatment. It may be caused by the higher porosity, lower penetration resistance and bulk density and smaller size of aggregates resulted by the rotivator. Result shows that however no tillage method caused the increase of diameter and improvement of aggregate stability, it also caused soil compaction, higher bulk density and penetration resistance, these factors will result in the decreasing of yield. Whereas, the use of moldboardplough and rotivator has the better result than other methods of improvement of soil physical properties and increasing in second cropping of yield production in paddy fields.