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Horticultural products are of great value to feed the growing population of the world. Acquiring the world free from hunger and to meet the growing food demand new insights and techniques are required in order to achieve sufficient and sustainable yields. Therefore, to search and test the efficacy of a new product continuous research should be followed up in this field. Instead of conventional mineral fertilizer biostimulants are very good alternatives to do research in such fields [1]. Biostimulants are defined as „„materials, other than fertilizers, that promote plant growth when applied in small quantities‟‟ and are also referred to as „„metabolic enhancers‟‟ [2]. In order to enhance the fruit size and quality plant growth regulators has been commercially used in many stone fruit crops [3]. Stress including biotic and abiotic alter the level of endogenous hormones and ultimately affect the crop growth, which can be overcame by application of exogenous growth regulators to enhance the yield. Qualitative and quantitative aspect of fruit growth can be achieved by using the plant growth regulators which in return increase the productivity [4]. Forchlorfenuron, a synthetic cytokinin with strong growth regulation activities has been found very effective in enhancing fruit growth by stimulating cell division and cell elongation. It has been found highly effective in increasing fruit size in some fruit crops [5]. Besides, it also modifies other fruit characteristics such as shape, dry matter content, carbohydrate metabolism and ripening process. Its treatment could also increase firmness of individual fruit, reducing TSS content and TSS /acid ratio of fruit, as well as, promote starch degradation but had no effect on titratable acid content [6]. Elanta Super is an organic growth promoter which contains N Acetyl Thiazolidine 4Carboxylic Acid (NATCA), 10% Folic acid with 0.2% adjuvant, used for plant growth increase in both fruit & production quality. It is a derivative of organic amino acid, which helps to develop fruits to its optimum level of size, shape, quality and taste. It is also useful for fruit setting, enhances quality, size, colour as well as taste and keeping quality of fruits. It is also a stabilizer buffer, to tolerate certain types of stresses more effectively [7]. A low-moderate chilling New Castle is the most commercial cultivar of apricot (Prunus armeniaca L.) in the mid-hills of Himachal Pradesh. This cultivar ripens towards the third week of May when no other fruit is available and hence fetches higher prices in the market. However, with the advancement of age, its fruit size and quality decreases which has less demand in market. In Himachal Pradesh, apricot is being cultivated at an elevation of 900 m to 2000 m above mean sea level over an area of 3660 ha with an annual production of 4704 MT in 2014-15 [8]. Leading growing districts are Solan, Shimla, Sirmour, Chamba, Kullu, Mandi, and Kinnaur. This study aimed to Abstract Being the third important stone fruit crops of India, apricot still requires a great improvisation in production point of view. Bio-regulators are being used by the growers to increase the yield by improving the yield attribute parameters. Keeping the objective to increase the yield, in the recent studies; twenty six-year-old apricot cv. New Castle trees were subjected to 11 treatments viz. Forchlorfenuron (CPPU) at 5 and 10 ppm and N-acetyl thiazolidine 4-carboxylic acid (NATCA) at 50 and 100 ppm and their combinations were applied at pink bud and petal fall stage during the year 2015 and 2016. Out of the two time of spray the petal fall stage was found to be superior in both the years. Foliar spray of CPPU at 10 ppm increased the physical parameters like pulp weight (16.10 g, 12.13 g/fruit), stone weight (2.6 g and 1.94 g/stone) and pulp to stone ratio (7.15:1) over control. Keeping all the observations in consideration CPPU 10 ppm at petal fall stage was found to be best among all the treatments.

Effect of Forchlorfenuron and N-acetyl Thiazolidine 4-carboxylic Acid on Chemical Parameter of Apricot (Prunus armeniaca L.) cv. New Castle