INFLUENCE OF LONG – TERM INTEGRATED NUTRIENT MANAGEMENT ON MICRONUTRIENT STATUS AND PRODUCTIVITY OF RICE (ORYZA SATIVA) IN AN ACID ALFISOL
Upinder Sharma-1 and S. K. Subehia-2
1-Department of Soil Science, CSK HPKV, Palampur, 176 062, (H.P.) India
2-Department of Agronomy, Forages and Grassland Management, CSK HPKV, Palampur, (H.P.) India
[Corresponding author E-mail-1: email@example.com]
Received: 10-08-2016 Accepted: 29-08-2016
The effect of long-term integrated nutrient management on rice yield and status of micronutrient cations in post harvest rice soils was studied during 2010-11 and 2011-12 at research farm of CSK Himachal Pradesh Agricultural University, Palampur, India in an on-going long term fertilizer experiment initiated in 1991 kharif season (May – October). Grain and straw yields of rice were recorded after 2010 and 2011. Pooled data of two years revealed that continuous substitution of 50% N through green manure (GM) in rice produced maximum rice grain (7.37 t ha-1) and straw (6.21 t ha-1) yield which was 16.8 and 14.8% higher over 100% NPK added through chemical fertilizers. However, 50% N substitution through farmyard manure (FYM) in rice was not only significantly at par with 50% N substitution through GM in respect of crop yields but also recorded highest improvement in soil micronutrient cations. Uptake of all the micronutrient cations increased with application of chemical fertilizers either alone or in combination with organics over control. The results of soil samples collected in post harvest rice soil (mean of two years) showed that content of all the micronutrient cations viz. zinc (Zn), copper (Cu), iron (Fe) and manganese (Mn) increased with the integrated use of organic and inorganic fertilizers for the last twenty years over application of chemical fertilizers alone and control. Application of chemical fertilizers alone led to decline in content of Zn, Cu and Mn over control.
Keywords: nutrient management, micronutrient, fertilizer, kharif season, cations