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Authors: RAJ RUSHI K, V.S.L
Title: Integrated use of phosphorus in Bt cotton
Language: en
Type: Thesis
Series/Report no.: D9401;
Agrotags: mastitis, antibiotics, diseases, livestock, animal husbandry, sampling, bacteria, economic systems, pathogens, biological phenomena
phosphorus, Bt cotton
Abstract: A field experiment entitled “Integrated use of phosphorus in Bt cotton” was conducted at Agricultural College Farm, Bapatla during kharif, 2011. The test soil was non-saline and clay loam in texture with slightly alkaline reaction. The soil was low in available nitrogen, medium in phosphorus and high in potassium status. The available micronutrients viz., Zn, Cu, Mn and Fe were above their respective critical limits. The treatments comprised of 60 kg P2O5 ha-1 (recommended dose); 60 kg P2O5 ha-1 + PSB; 30 kg P2O5 ha-1 + PSB; PSB; 60 kg P2O5 ha-1 + FYM; 30 kg P2O5 ha- 1 + FYM; FYM; 60 kg P2O5 ha-1 + PSB + FYM; 30 kg P2O5 ha-1 + PSB + FYM and PSB + FYM. The experiment was laid out in RBD with ten treatments replicated thrice. FYM @ 10 t ha-1 was applied 10 days before sowing while PSB @ 5 kg ha-1 was applied one day before sowing. Phosphorus was applied basally as per the treatments in the form of SSP. Recommended dose of nitrogen and potassium were applied in the form of urea and muriate of potash uniformly to all the treatments in four equal splits. The influence of various treatments on biomass production, yield attributes, yield, nutrient uptake, soil available nutrient status, bacterial population and phosphatase activity were determined at 45, 90 DAS and at harvest. Highest biomass at harvest, boll number and yield were recorded by the integrated treatment that received 60 kg P2O5 ha-1 + PSB + FYM followed by 60 kg P2O5 ha-1 + FYM and 60 kg P2O5 ha-1 + PSB. An increase of 32, 25 and 8 per cent in seed cotton yield was recorded by the treatments that received maximum inorganic phosphorus (60 kg P2O5 ha-1) along with PSB and FYM, with FYM and with PSB, respectively over only inorganic treatment. The treatment receiving 30 kg P2O5 ha-1 + FYM + PSB was at par with application of 60 kg P2O5 ha-1 in seed cotton production. All the above parameters were markedly influenced by levels of phosphorus applied. The uptake of macronutrients viz., N, P and K was markedly influenced by the treatments with maximum values recorded by the treatment that received 60 kg P2O5 ha-1 + FYM + PSB. Their uptake significantly differed with increase in dose of phosphorus applied at all growth stages. Integrated use of 60 kg P2O5 ha-1 + FYM + PSB resulted in significant increase in uptake of all micronutrients (Zn, Cu, Mn and Fe) at all stages except Cu at 90 DAS. The soil properties at harvest viz., bulk density, pH, EC and CEC were not markedly influenced by the imposed treatments while significantly high organic carbon was recorded in FYM treated plots. Though there was no significant influence of the treatments on available nitrogen and potassium, comparatively higher values of nitrogen were observed in organic treated plots. The available phosphorus content was markedly influenced by level of phosphorus as well as components of integration at all the crop growth stages. Highest available phosphorus was recorded on integration of maximum dose of phosphorus with PSB and FYM. The available micronutrient contents in soil did not show any marked difference among the treatments at all the stages of crop growth. Application of FYM and PSB either individually or in combination showed significant influence on bacterial population but not on acid and alkaline phosphatase activities of soils at 45, 90 DAS and harvest. Increase in inorganic phosphorus upto 60 kg P2O5 ha-1 did not influence the bacterial population and phosphatase activity of soils.
Issue Date: 2012
Appears in Collections:Theses

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