• ELAVARASI P
• DHANASEKARAN K

ABSTRACT Water stress is the wide spread hydro metrological syndrome of prolonged period of water scarcity, which severely affect agricultural productivity. Water stress induced changes are mainly related to metabolic functions, such as reduced synthesis of photosynthetic pigments, accumulation of osmoprotectants like proline in the cell and decline in the cell membrane stability. In order to minimize the effect of water stress, the antitranspirants are applied as foliar spray. The present investigation was carried out to find the effect of irrigation interval and foliar application of different antitranspirants on nutrient uptake and yield of black gram (vigna mungo). A field experiment was conducted during March-May 2017. The treatments consisted of three irrigation interval viz., 5 DAI( Days after irrigation), 10 DAI and 15 DAI and eight treatments of foliar applications [T1- control, T2- PPFM(pink pigmented facultative methalotrophs), T3- salicylic acid, T4- miracle gold, T5- green gold, T6- ATP 67@ 0.3%, T7- ATP 67 @ 0.5%, T8- ATP 68@ 0.3%, and T9- ATP 68@ 0.5%]. The results of the study revealed that increase in the irrigation interval consistently decreased the nutrient uptake and yield of blackgram. Application of antitranspirants to the blackgram reduced the impact of water stress in respect of yield and nutrient uptake by seed and haulm. Foliar application of ATP 67 @ 0.3% to plants irrigated at 5 DAI, (I1T6) recorded significantly highest values in yield attributes viz., number of pods per plant (23.17), number of seeds per pod (6.02), seed yield (1235 kg ha-1) and haulm yield (2295.33 kg ha-1) as compared to other treatments. The uptake of nutrient was also affected due to water stress. Increased moisture content in soil enhanced the uptake of NPK by seed and haulm. The treatment I1T6 (5 DAI + ATP 67@ 0.3% foliar spray) recorded the highest NPK uptake of 39.47 kg ha-1, 6.58 kg ha-1, 23.17 kg ha-1 by seed and 56.6 kg ha-1, 5.51 kg ha-1, 39.52 kg ha-1 by haulm respectively. This was followed by I1T7 (5 DAI + ATP 67 @ 0.5%). The result of the study also showed that application of antitranspirants (ATP 67 @0.3%) to plants irrigated at 10 DAI (I2T6) produced comparable yield as that of the plant irrigated at 5 DAI without ant antitraspirant spray(I1T1).

"Effect of irrigation intervals and antitranspirants application on the yield and nutrient uptake by blackgram", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 5, page no.809-819, May-2018, Available :http://www.jetir.org/papers/JETIR1805555.pdf

"Effect of irrigation intervals and antitranspirants application on the yield and nutrient uptake by blackgram", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 5, page no. pp809-819, May-2018, Available at : http://www.jetir.org/papers/JETIR1805555.pdf