Volume No. 7 Issue No.: 4A Page No.: 1571-1576 April-June 2013

 

IMPACTS OF LONG TERM FERTILIZATION ON SOIL NUTRITIONAL QUALITY UNDER FINGER MILLET : MAIZE CROPPING SEQUENCE

 

Hemalatha S.*1 and Chellamuthu S. 2

1. Department of Soil Science and Agricultural Chemistry , Tamil Nadu Agriculture
University, Coimbatore (INDIA)
2. Water Technology Centre, Tamil Nadu Agricultural University, Coimbatore (INDIA)

 

Received on : December 02, 2012

 

ABSTRACT

 

A long term field experiment on different doses of graded fertilizers with and without FYM in finger millet maize cropping sequence is in progress at the Tamil Nadu Agricultural University, Coimbatore, India since 1972. The effect of continuous fertilization on soil nutrient status was studied after 36 years of cropping cycle on an Inceptisol. The soil reaction, as reflected in the pH, soil salinity as measured by EC has not changed significantly due to the different fertilizer schedules adopted over these years. The cation exchange capacity of the soil has increased significantly in the treatment receiving 100 per cent NPK+FYM. The organic carbon contents of the soil has increased significantly in all the treatments that received NPK at different levels. The highest value of 6.2 g kg-1 was recorded in the treatment receiving NPK+FYM @ 10 t ha-1 which 55 per cent higher than control and also 107 per cent higher than the initial status. Available N, P and K status increased due to 100 per cent NPK+ FYM application and recorded 195,26.7, 639 kg ha-1respectively. Exclusion of nutrients led to depletion of that nutrient in soil. Generally, there was a reduction in total nutrient content of the soil from the initial level. The available status of Ca and Mg of the soil have increased significantly in all treatments recording the highest status on continuous application of integrated fertilizer management. The micronutrients like iron, zinc, manganese and copper were significantly higher in the treatment receiving 100 per cent NPK + FYM. The Integrated nutrient management practice sustained the soil fertility and soil health.

 

Keywords : Long term fertilization, Soil fertility, Health, INM, Maize cropping

 

 

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