A field experiment was conducted during the year 2007-2008 and 2008-2009 in Bhubaneswar, India to study the effect of tillage, irrigation and nutrient levels on growth and yield of sweet potato (Ipomoea batatas L.) in rice fallow. The results revealed that the conventional tillage system of sweet potato planting recorded maximum fresh root yield. During the year 2007-2008 and 2008-2009, the fresh root yield in this system was 4.6% and 30.3% higher than the minimum tillage treatment, respectively. Similarly 5.6% and 21.7% higher green fodder yields were obtained in conventional tillage compared to minimum tillage treatment during the year 2007-2008 and 2008-2009, respectively. But lower consumptive use and water use efficiency (WUE) were observed in conventional tillage than minimum tillage. Increasing irrigation and nutrient levels increased root and fodder yield significantly in both the years as well as reduced the soil compactness. The consumptive use and WUE were decreased with increasing irrigation levels, and increased with increasing levels of nutrients. Minimum tillage has advanced planting of sweet potato 15 to 17 days and produced 80–90% root and fodder yield of conventional tillage.

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A field experiment was conducted during 2018 at the Instructional Farm, Bidhan Chandra Krishi Viswavidyalaya, Jaguli, Nadia to study the effects of three irrigation regimes (CPE 60 mm, CPE 50 mm and CPE 40 mm) and five nutrition (control, FYM @ 2.5 t/ha, cowdung @ 10 t/ha, poultry manure @ 2.0 t/ha and RDF) on summer cowpea. The results showed that under plenty water supply condition, scheduling of irrigation at CPE 40 accompanied with 100% recommended dose of fertilizers (12.5:25:12.5 kg/ha of N, P and K, respectively) as basal was found to be the best treatment combination for obtaining maximum growth, yield components, pod and seed yield and moderate crop water use efficiency. Under limited or water constraint, deficit irrigation schedule at CPE 50 or CPE 60 in association with 100% RDF was the alternative option for achieving relatively higher pod and seed yield and higher to maximum crop water use efficiency. The seasonal yield response factor for cowpea was found to be 4.64.

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The field experiment was conducted during the winter seasons of 2009–10, 2010–11 and 2011–12 on a sandy loam soil of lower Indo-Gangetic plains of Eastern India to optimize irrigation schedule and phosphorus level on broad bean. The treatments comprised of three irrigation levels viz. 30, 60 and 90 mm of cumulative pan evaporation (CPE) and four phosphorus levels viz. 0, 30, 60 and 90 kg P2O5 ha-1 were laid out in a split plot design. The results showed that irrigation at CPE 30 mm and phosphorus at 90 kg P2O5 ha-1 registered significantly the highest average seed yield of 4.76 and 5.37 t ha-1, respectively. The interaction effects revealed that irrigation at CPE 30 mm with 90 kg P2O5 ha-1 recorded significantly mean maximum yield (5.69 t ha-1) and gross return (Rs. 45520 ha-1), net return (Rs. 28870 ha-1) and BCR (1.73). In limited water availability, higher seed yield (5.13 t ha-1), maximum WUE (37.18 kg ha-1 mm-1), higher gross return (` 41040 ha-1), net return (Rs. 25590 ha-1) and BCR (1.66) were found with irrigation at CPE 90 mm with 90 kg P2O5 ha-1. Significant linear relationships were detected between yield with applied irrigation water (R2=0.964) and phosphorus (R2=0.989). Thus imposition of irrigation at CPE 90 mm coupled with 90 kg P2O5 ha-1 could be recommended to broad bean growers for deriving higher yield, WUE and income.