The Effect of Tillage Systems, Type of Organic Fertilizer and the Level of Binary Addition of Nitrogen and Phosphorus on the Growth and Yield of Clover in Gypsum Soil

Abstract

Abstract A field experiment was conducted at the research station of the College of Agriculture - University of Tikrit for the agricultural season (2021-2022), and the experiment factors were three, namely: the first factor is tillage systems, as two systems of tillage were applied (no-tillage and Reduced tillage) and the second factor was the type of organic fertilizer and it included (Sheep waste and waste Mushroom), while the third factor was the level of binary addition of nitrogen and phosphorus, and it included three levels of fertilization (0%, 100%, and 125%), according to the fertilizer recommendation. The experiment was carried out according to the split-split plot system with a randomized complete block design (R.C.B.D) and with three replications. The treatments were distributed as follows: tillage systems (NT, RT) in the main plot, and the application of the type of organic fertilizer (O1, O2) In the sub plot, the levels of binary addition of nitrogen and phosphorus (M0, M1, M2) were placed in the sub-sub plots, and the results of the experiment showed that the system of Reduced tillage was significantly superior to the system of no-tillage in all the studied traits, and sheep waste was significantly superior to mushroom waste in All the characteristics of the study, as well as the level of binary addition M2 was significantly superior to the other levels in all the characteristics of the study. The results showed that the treatment (T1O1M2) was significantly superior in all traits of vegetative growth and yield traits of clover plant.