Effect of long term fertilizer and manure application on chemical properties of soil, nutrient availability and yield of soybean (Glycine max) and safflower (Carthamus tinctorius) in Vertisole

Abstract:

The present study was undertaken during 2020-21 in an ongoing long-term fertilizer experiment
initiated during 2006-2007 at Vasantrao Naik Marathwada Agricultural University, Parbhani with fertilizer and manure applications to assess the impact of long-term fertilization on soil
chemical properties, nutrient availability and yield of soybean-safflower cropping sequence in
Vertisols (Typichaplusterts) having 12 treatment framed in a randomized block design (RBD). The result indicated that application of FYM and chemical fertilizer, i.e., chemical properties of
soil such as pH and EC, reduced with the application of inorganic fertilizer in conjunction with
organic100 % NPK +FYM @5 t ha-1and only FYM@ of 10 t ha-1 treatment. At the same time, highest pH and EC were recorded in 150 % NPK and 100% NPK + ZnSO4 treated plot. Organic carbon in soil significantly improved with the combined application of organic manure with
inorganic fertilizer100% NPK + FYM @ 5 t ha-1 and lowest at treatment control and N alone treated plot. Cation exchange capacity of soil significantly improved in treatment, receiving
100 % NPK+ FYM @ 5 t ha-1and minimum CEC was recorded at treatment control. Major soil nutrients like Nitrogen, Phosphorus, and Potassium and Sulphur availability increased with
the integrated use of chemical fertilizer with FYM, i.e. 100% NPK+ FYM 5t ha-1, followed by
treatment receiving 150% NPK over the other treatment. The DTPA micronutrient like Zn, Fe, Mn and Cu were maximum recorded on receiving 100% NPK + FYM @ 5t ha-1except Zn maximum were noted in treatment receiving 100 % NPK +ZnSO4 25 kg ha -1 and at par with
100% NPK + FYM and lowest at treatment control except iron lowest at treatment receiving imbalance supply nutrient 100 % N alone. The maximum grain and straw yield of soybean and safflower crop under soybean – safflower cropping equence was recorded in 100% NPK + FYM @5 t ha-1 plot followed by treatment receiving 150% NPK. Continuous application N alone adversely effect on yield of soybean – safflower cropping sequence. Among the various treatments, the application of NPK + FYM proved superior, which had not only better chemical
properties but also the nutrient availability and yield of soybean – safflower cropping sequence
in Vertisol.