SUMMARY

This study was realised to compare growing of tomato and spinach in the organic and conventional agricultural conditions. The experiment was set up in the different two parcels which are treated green manure and untreated green manure. The effects of different organic materials such as; farmyard cattle (CM), poultry (PM), and sheep (SHM), seamoss (SM), bioenzym (BİO) and NP were searched on yield and quality properties of H 2274 cv. tomato variety and matador spinach variety.

Experiment was planned in Randomised Block Spilt Parcel design with 3 replication. A parcel area is 16.20 m2 at the tomatoes experiment and 6.75 m2 at the spinach experiment.

During experiment, the soil analysis were done before sowing and after harvest for determining soil structure in the every year.

End of the study, the highest yields were gotten from SHM (4682 kg/da), CM (4300kg/da), PM (4242 kg/da) and NP (4078 kg/da).

The result of this study were subjected to cost analysis to compare conventional and organic agricultural systems. It was used to Gross Margin (GM) Method for cost analysis.

Treated green manure yield was higher 49,54% than untreated green manure.

On the other hand, untreated green manure’s number of the discard fruits were found higher 10,58% than treated green manure.

In the spinach experiment, plant quality and yield were highest in untreated green manure than treated green manure. The untreated green manure yield was better than treated green manure (9,64%). Plant nutrient effects were found statistically significant on the yield. The highest yields were taken from NP (1150,29 kg/da), PM (1134,54 kg/da) and CM (1118,56 kg/da). The lowest yield was gotten from BIO (738,22 kg/da).

The interaction of between plant nutritionist and green manure applications were found statistically significant on the amount of nitrate. The highest nitrate amounts were taken from NP application on treated green manure (529,73 mg/kg) however, SM application on treated green manure was given the lowest nitrate amounts (54,24 mg/kg).

Green manure application was effected positively soil structure in the both experiment.

The results were showed that, economically yield was gotten with using of CM, PM and SHM as plant nutrient like using of NP. The better results would taken from combination of CM, PM and SHM applications. Necessity of the studies on crop rotations, green manure, compost study, plant nutrient and pesticides which suitable for organic agriculture were determined at the end of the experiment.

The result of the cost analysis were; in all green manure applications GM were positive but in without green manure applications only BİO and SM applications have negative GM in tomatoes. The higher GM was became from SHM with green manure, and the highest GM was became from CM without green manure.