Investigation of nutrition and some heavy metal contents of canola (Brassica napus L.) plant: case of Suleymanpaşa district

Conventional agriculture is used to get the highest yield from the unit area. Various problems such as pollution arise with unconscious fertilization. This situation can be overcome with the evaluation of agricultural areas and correct fertilizer applications. Sustainable soil fertility must be ensured for sustainable agriculture. This study was carried out to investigate the nutrition and some heavy metal contents of Canola plant grown in Tekirdağ province Süleymanpaşa district. For the purpose of the study, soil and plant samples were taken from 20 neighborhoods of Süleymanpaşa district and analyzed. The analysis results of the soil and plant samples were compared with the reference values, the nutrition and some heavy metal contents of the Canola fields were determined, and the maps were drawn with geostatistical modeling. According to the findings, the nitrogen, phosphorus, potassium, calcium, magnesium, iron, copper, manganese, zinc, boron, nickel and aluminum values of the plant samples taken from the canola cultivation areas were between %3,67-%7,31; %0,21-%1,23: %1,92-%2,72; %1,53-%4,78; %0,22-%0,51; 279,50 mgkg-1-1161,50 mgkg-1; 42,00 mgkg-1-54,25 mgkg-1; 241,00 mgkg-1-447,75 mgkg-1; 40,25 mgkg-1-71,75 mgkg-1; 46,00 mgkg-1-140,50 mgkg-1; 3,49 mgkg-1-16,40 mgkg-1; 129,25 mgkg-1-781,00 mgkg-1.It was determined that 30% of these values had P deficiency and 100% of them K deficiency. When macro plant nutrients are evaluated, 90% of them had high ratio of N, 15% of them had high ratio of P, 25% of them had high ratio of Ca, When micro plant nutrients are evaluated, 100% of them had toxic level of Fe and Cu, 95% of them had toxic level of Mn and 65% of them had toxic level of Zn and 80% of them had toxic level of B.N in 10% of samples and P in 55% of them, Ca in %75 of them, Mg in %100 of them, Mn in %5 of them, B in %20of them, Zn in %35 of them are sufficient. It has been determined that nickel, one of the heavy metals, is 75% toxic. Some soil properties of soil samples taken from canola fields change as texture class loam, clay loam, sandy clay loam, respectively. According to this, 35% of the soils are in loam, 50% are in clay loam and 15% are in sandy clay loam texture class. The pH is between 4.76-7.79, 10% medium acid, 15% slightly acid, 20% neutral and 55% slightly alkaline. The EC is between 0.01% and 0.06%, and 100% of the soil is salt-free. Organic matter is between 0.88% and 2.55%, and 5% of the soil has very little, 70% less and 25% has moderate organic matter. Lime trace quantity between -20.64%, and the soils are 35% lime-free, 30% calcareous, 30% moderately calcareous, and 5% more calcareous. These values found among N deficiency is observed in 60% of these values and Mg deficiency in 15%. When macronutrients were evaluated, it was determined that 55% of P, 15% of K, 75% of Ca were in excess level. It was determined that 40% of them were N, 25% of them Ca, 85% of them Mg were at moderate level. 45% of them were P and 85%.As a result of these data, priority should be given to potassium and phosphorus fertilization in canola agriculture in Süleymanpaşa District.