CONCLUSION AND RECOMMENDATIONS File menu

7. CONCLUSION AND RECOMMENDATIONS

As we have seen in the last parts, the product of this effort is software which can do the designing of a wheelchair wheel move irrigation system perfectly. Moreover, by adding necessary sub-routines to FARMWAT 1.0, we can convert it into a secure tool for designing different irrigation systems under pressure. While one of the goals of developing these irrigation systems is to increase water consume efficiency, such softwares can play their role of achieving to this goal effectively, by helping the designing of efficient irrigation systems. Other consequences of developing FARMWAT are allowing increasing the designing training of irrigation systems under pressure. References 1. Jenson, M.E., ed., Design and Operation of Farm Irrigation Systems. St.Joseph, Michigan: American Society of Agricultural Engineers, Monograph Number 3, 1980. 2. Hansen, V.E., O. W. Israelsen, and G. E. Stringham, Irrigation Principles and Practices, 4 th edition. New York: John Wiley and Sons, 1980. 3. Smedema, L. K. and D. W. Rycroft, land drainage. Ithaca, New York: Cornell University Press, 1983. 4. Warrick, A. W. and D. R. Nielsen, “Spetial Variability of Soil Physical Properties in the Field” in applications of soil physics, ed., D. Hillel. New York: academic press, 1980, pp. 319-344. OPTIMIZATION OF WATER AND NUTRIENT REQUIREMENT FOR YIELD MAXIMIZATION IN HYBRID RICE UNDER DRIP FERTIGATION SYSTEM

V. KUMAR, A.GURUSAMY, P.P. MAHENDRAN S.MAHENDRAN

1 From the above study, it can be concluded that the rice hybrid CoR H3 responded well to the combination of drip irrigation at 150 PE with drip fertigation of 100 per cent of P and K 50 P and K as basal remaining, N, P and K as WSF + LBF maximizing the yield and gross income. However, drip irrigation at 150 PE with drip fertigation of 75 per cent of P and K 50 P and K as basal remaining, N, P and K as WSF + LBF recorded higher net income compared to other treatments. Hence, drip irrigation at 150 PE with drip fertigation of 75 per cent of P ABSTRACT Field experiments were conducted at central farm, Agricultural College and Research Institute, Madurai, during Kharif and Rabi 2008 - 2009 to study the effect of drip fertigation on growth and yield of hybrid rice. The experiments were laid out in factorial randomized block design with four replications. The treatments consisted of two irrigation regimes drip irrigation at 100 and 150 PE and five nutrient levels viz., soil application of 100 RDF, drip fertigation of 100 RDF P as basal, N and K as urea and Kcl, drip fertigation of 50, 75 and 100 RD of P and K 50 P and K as basal remaining N, P and K as WSF + LBF. Drip irrigation was scheduled once in two days and fertigation was given once in six days as per the treatment schedule. Drip irrigation at 150 PE exhibited better plant height, number of tillers, leaf area index, root characters and dry matter production in hybrid rice. Similarly, it accounted for higher number of productive tillers per hill, panicle length, number of filled grains per panicle, grain and straw yields. The sterility percentage was also lesser in this treatment. Among the nutrient levels, drip fertigation of 100 per cent RD of P and K 50 P and K as basal remaining, N, P and K as WSF + LBF registered better plant height, number of tillers, leaf area index, root characteristics and dry matter production. Yield attributes viz., higher values of number of productive tillers per hill, panicle length, number of filled grains per panicle, grain and straw yields of hybrid rice found to be comparable with drip fertigation of 75 per cent of P and K 50 P and K as basal remaining, N, P and K as WSF + LBF The above treatment also recorded higher N,P and K uptake and lower post harvest soil available N, where as the post harvest soil available P and K were lesser under drip fertigation of 50 per cent of P and K 50 P and K as basal remaining, N, P and K as WSF + LBF Drip irrigation at 100 PE was found to be better than other irrigation regime 150 PE as for as water use is concerned. It has registered an optimum consumptive water use and higher water use efficiency. Net return and benefit cost ratio were higher with drip irrigation at 150 PE with drip fertigation of 75 per cent of P and K 50 P and K as basal remaining, N, P and K as WSF + LBF. It was followed by drip irrigation at 150 PE with drip fertigation of 100 per cent of P and K 50 P and K as basal remaining, N, P and K as WSF + LBF 1- ProfessorSWC, Associate ProfessorAgronomy, Associate ProfessorSoil Science and Late Chief Scientist, AICRP-WM Scheme, Madurai Centre, TNAU, Madurai-625104, INDIA and K 50 P and K as basal, remaining N, P and K as WSF + LBF was found to be the best treatment combination for hybrid rice. Objectives 1. To study the performance of raised bed system of rice cultivation under drip fertigation system 2. To find out the effect of drip fertigation on the growth and yield of rice grown under raised bed system of cultivation. 3. To work out the economics of drip fertigation on rice grown under raised bed system of cultivation. Technical Programme Treatments a. Irrigation regimes I 1 - Irrigation at 100 PE I 2 - Irrigation at 150 PE

b. Nutrient management