No abstract

No abstract

No abstract

No abstract

No abstract

Water stress induces some physiological changes in plants and has cumulative effects on crop growth and yield. Field experiments were conducted to study the effect of deficit irrigation (DI) on yield and some physiological parameters in cotton and maize in a sequential cropping system. Creation of soil moisture gradient is indispensable to explore the beneficial effects of partial root zone drying (PRD) irrigation and it could be possible only through alternate deficit irrigation (ADI) practice in paired row system of drip layout that is commonly practiced in India. In the present study, PRD and DI concepts (creation of soil moisture gradient) were implemented through ADI at two levels of irrigation using drip system. Maize was sown after cotton under no till condition without disturbing the raised bed and drip layout. Relative leaf water content (RLWC) and chlorophyll stability index (CSI) of cotton and maize were reduced under water stress. A higher level of leaf proline content was observed under severe water-stressed treatments in cotton and maize. RLWC and CSI were highest and leaf proline content was lowest in mild water deficit (ADI at 100% crop evapotranspiration once in three days) irrigation in cotton and maize. The same treatments registered higher values for crop yields, net income and benefit cost ratio for both the crops.

No abstract

Twelve cultivars of banana plants were grown in field conditions and were studied under two irrigation regimes under ratoon season in order to evaluate the relative water content, soluble protein content, total chlorophyll content and yield changes induced by water deficit. Irrigation was applied when soil water potential reached at 80 per cent ASM for the wet treatments and 50 per cent ASM for the stressed treatment plots. The ASM were calculated based on the soil moisture release curve. The soil moisture content was measured by using pressure plate membrane apparatus. The cultivars and hybrids of Karpuravalli, Karpuravalli x Pisang Jajee, Saba, and Sannachenkathali, the RWC was reduced in water-stressed leaves with 8 per cent over control, which could have accounted for the decreased soluble protein, total chlorophyll content and yield in the per cent reduction of 9 and 8 than the other cultivars and hybrids. The highest reduction of 24 per cent in RWC leads to 19 and 18 per cent reduction in soluble protein and chlorophyll content due to water deficit were registered by the cultivars and hybrid of Matti, Pisang Jajee x Matti, Matti x Anaikomban and Anaikomban x Pisang Jajee leads to reduce the yield.