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STUDY ON CHEMICAL AND BIOLOGICAL PROPERTIES OF SOIL UNDER LONG TERM SOIL FERTILITY TRIAL IN RICE-WHEAT CROPPING SYSTEM AT KHAJURA, NEPALGUNJ
Babita lamichhane

Last modified: 2017-08-07

Abstract


ABSTRACT

A field experiment was conducted at Regional Agriculture Research Station, Nepalgunj Banke to study the effect of organic and inorganic fertilizers from the long term fertility trial in rice-wheat cropping system on selected soil properties. Nine treatments viz. control, 100:00:00; 100:30:00; 100:00:30; 100:30:30; 50:20:20 50:00:00; 50:20:00 N:P2O5:K2O kg/ha and 10 t/ha of FYM/compost were replicated three times in randomized complete block design. Soil sample were collected from each plot after rice harvest and subjected to various soil chemical and biological properties analysis. Results of the different level of N, P2O5, K2O and FYM revealed that soil organic matter content was significantly affected due to application of different treatments. The highest percentage of available nitrogen content (0.2%) phosphorus content (30.61kg/ha) and potash content (269.34kg/ha) was obtained from T5 (100:30:30 N: P2O5: K2O kg/ha). T9 (10ton FYM/ha) also gave considerably higher amount of available nitrogen, potash and phosphorus content which is at par with T5. Similarly, the result of soil organic matter indicates that the highest percentage of soil organic matter was found from T9 (10t/ha FYM) followed by T5 (100:30:30 N: P2O5: K2O kg/ha). Similarly, the highest number of microbial count was obtained from T5 and then from T9 and the least in case of T1. The continuous use of appropriate dose of inorganic fertilizer on the soil system is helpful in increasing the availability of SOM in soil which has positive correlation in the availability of soil nitrogen as well. Also the use of organic matter like FYM and full dose of NPK in long term has also similar impact on soil microbial population with its impact on soil sustainability, nutrient availability and stability on crop production. Long term application of FYM and full dose of NPK gives the better result in all of the observed parameters. Application of only N, P, and K individually leads to serious decline in soil fertility.

Key words- Fertilizers, Inorganic, Microbial count, Organic, Rice, Soil properties

 


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