It was reported that water resources and ground water reduces day by day but its consumption in different sector increases rapidly. In India agriculture is largest water consumer (81%) sector (WRI, 2007) and use of water in an efficient way is demand of time. It has been scientifically recognized that adoption of drip fertigation method is an option for efficient use of water and nutrients through improvement in crop yield per unit volume of water and nutrients used (Bar-Yosef, 1999;Patel and Rajput, 2011). Drip fertigation allows continuous irrigation and fertilizer injection into the root zone. Soil physicochemical properties are important aspects of soil quality that can change with long-term drip irrigation due to physical and chemical stress evidence of soil structural decline, such as increased bulk density under drip irrigation has been reported (Clark, 2004). Moreover, drip irrigation whereby a certain portion of the soil is wetted also causes the spatial variability of soil physical and hydraulic properties. Therefore, evaluation of spatial variability of soil characteristics and the vertical distribution of nutrients in soil under drip fertigation system can act as a very useful tool for the determination of fluctuations in soil behavior, especially its nutrient supplying capacity. Keeping the above facts in mind, the present investigation was carried out to know the soil fertility status under long-term drip fertigation system in coconut under All India Coordinated Research Project on coconut variety Shakhi Gopal Tall with long term drip fertigation system in BAU, Sabour under following treatments viz. T1 = Control, T2 = 25% of the recommended dose of NPK fertilizers (RDF) through drip system, T3 = 50% of the RDF through the drip system, T4 = 75% of the RDF through the drip system, T5 = 100% of the RDF through the drip system, T6 = 100% of the RDF through soil application. The results indicated that bulk density, particle density and pore space of soils were found to have no significant difference among the treatments and across different soil depths. Bulk density, particle density and pore space varied from 1.41 to 1.47 Mg m -3 , 2.23 to 2.25 Mg m -3 , and 31.9 to 36.6%, respectively, among all soils. Void ratio varied from 0.51 to 0.59 over all the soils. Void ratio and air-filled porosity were not significantly different among the treatments but significant difference was observed across the soil depths. Maximum water holding capacity of soils under different treatments across varying soil depths was not significantly different from each other. Soil pH and EC of all the treatments was not significantly different but decreased significantly with increasing soil depths. All the treatments for CEC and organic carbon content of soils were not found to be significantly different and depthwise were significantly different. Organic carbon content varied significantly among all the treatments and also across the varying soil depths. Available nitrogen, phosphorus and potassium content were low, medium and l...

A study was conducted during 2017-18 under the All India Co-ordinated Research Project initiated in 2009 at research farm of Bihar Agricultural University, Sabour, Bhagalpur. The aim of this study was compare the nutrient concentration of coconut leaves at different nutrient levels through drip fertigation in a Randomized Block Design (RBD) with four (4) replications. Result was observed that leaf Nitrogen, Phosphorous, Sulphur, Iron, Manganese, Copper and Boron content under different fertigation treatments were not significantly different from each other. The content of micronutrients in leaf were found to increase with increasing levels of fertilizer in the treatments. Cation Exchange Capacity was positively correlated with all the leaf nutrients. Organic carbon did not show remarkable relation with plant nutrient parameters. Soil K content of all three depths was positively correlated with all the leaf nutrient elements. Soil pH value was positively correlated with leaf P content in coconut which explains that leaf P content is directly proportional to the soil pH value. Electrical conductivity (EC) of soil was also positively correlated with P, K and B concentration in coconut leaf. Correlation coefficient value between CEC and leaf nutrient contents explains that 2nd depth of soil is more important for mineral nutrition of coconut palm. Correlation coefficient values between soil P content and leaf nutrient content. Higher correlation coefficient value was found at lower soil depth between available sulphur content in soil and sulphur content in leaf of coconut. This result suggests that inherent supplying capacity of micronutrient of experimental soil is not so influential for higher plant growth, but application of N, P and K fertilizers trigger the absorption capacity for micronutrient from soil. Under different NPK levels, the applied NPK does not have significant effect on leaf N, P, S, Zn content after five (5) years of experimentation while the effect was found to be significant for few elements like K, Fe, Mn, Cu, and B. An increasing trend was observed for leaf nutrient content with increasing levels of fertilizer application.

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