EFFECT OF COMBINED USE OF ORGANIC AND INORGANIC FERTILIZERS ON SOIL CHEMICAL PROPERTIES AND NUTRIENT USE EFFICIENCY IN KHARIF MAIZE
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Date
2022-08-12
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guntur
Abstract
A field experiment entitled “Effect of Combined Use of Organic and Inorganic Fertilizers on Soil Chemical Properties and Nutrient Use Efficiency in Kharif Maize” was conducted at Agricultural College Farm, Bapatla during 2018. The test soil was non-saline, sandy loam in texture with acidic reaction. The soil was low in available nitrogen, high in phosphorus and high in potassium status. The available Cu, Mn and Fe were sufficient while Zn was deficient.
The experiment was laid out in RBD with seventeen treatments replicated thrice. The treatments comprised of T1-Absolute control; T2- 75% of RDF (N in three splits);T3- 75% RDF (N in four splits); T4 – 100% RDF (N in three splits); T5- 100% RDF (N in four splits); T6- 75% of RDF (N in three splits)+ Vermicompost (2.5 t ha-1); T7- 75% of RDF (N in four splits) + Vermicompost (2.5 t ha-1); T8- 100% RDF (N in three splits)+vermicompost (2.5 t ha-1); T9-100% RDF (N in four splits)+vermicompost(2.5tha-1);T10- 75% of RDF ( N in three splits)+azosprillum+PSB+ KSB;T11- 75% of RDF (N in four splits)+Azosprillum+PSB+KSB; T12–100% RDF (N in three splits) +azosprillum+PSB+KSB; T13- 100% RDF (N in four splits)+azosprillum +PSB+KSB;T14-75%RDF(N in three splits)+vermicompost+azosprillum+ PSB+ KSB; T15- 75%RDF (N in four splits)+vermicompost +azosprillum+ PSB+KSB;T16-100%RDF(N in three splits)+vermicompost+azosprillum +PSB+KSB;T17-100%RDF (N in four splits)+vermicompost+azosprillum +PSB+KSB.
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The influence of various treatments on plant height, grain &stover yield, nutrient content, uptake and soil properties (physical, physico-chemical, available nutrients and biological) were determined by standard procedures at different stages.
Among the treatments, 100%RDF(N in four splits)+vermicompost +azosprillum+ PSB+KSB treated plot recorded maximum dry matter, grain and stover yield followed by 100% RDF (N in three splits)+vermicompost +azosprillum+PSB+KSB.However the treatments with 100% RDF with N in 3 or 4 splits and also with bio fertilizer alone or in combination with vermicompost did not show any significant difference. The treatments imposed had no significant effect on harvest index.
Higher N,P and K contents content was recorded by the application of 100% RDF (N in four splits) +vermicompost+azosprillum+PSB+KSB, at all stages of crop growth. Micronutrient (Fe, Cu, Mn and Zn) contents were also maximum with same treatment which was on par with treatment which received 100% RDF (N in three splits)+vermicompost+azosprillum+PSB +KSB.
The uptake of macronutrients (N,P, K) and micronutrients at all stages was markedly influenced by the treatments with maximum values recorded by the treatment that received 100% RDF (N in four splits)+vermicompost +azosprillum+ PSB+ KSB. Which was at par with 100% RDF (N in three splits)+vermicompost+azosprillum+PSB+KSB and 100% RDF (N in four splits) +azosprillum+PSB+ KSB.
The soil properties viz. pH and EC were not significantly influenced by the imposed treatments, while highest organic carbon was recorded in 100% RDF (N in four splits)+vermicompost+azosprillum+PSB+KSB treated plot. Similar trend was observed in available macro (N P and K) and micro nutrients (Fe, Cu, Mn and Zinc) . The highest available nutrient content was recorded in the treatment with 100% RDF (N in four splits)+vermicompost +azospirulam+PSB+KSB but no significant difference was observed in the treatment treated with N in three split or four splits . However the plots treated with organics showed significant positive effect on soil properties when compared with the plots treated with inorganic.
Application of inorganics, biofertilizers, vermicompost showed significant influence on biological activity of soil. Addition of organic fertilizers proved to be more efficient in improving the enzyme activities (urease, dehydrogenase and phosphatase) significantly.
Description
EFFECT OF COMBINED USE OF ORGANIC AND INORGANIC FERTILIZERS ON SOIL CHEMICAL PROPERTIES AND NUTRIENT USE EFFICIENCY IN KHARIF MAIZE