Chemical Science Review and Letters ISSN 2278-6783 Chem Sci Rev Lett 2017, 6(21), 581-584 Article CS112048031 581 Research Article Effect of Humic Acid and Micro Nutrients on Growth and Yield of Poly House Grown Cucumber (Cucumis sativus L.) K D Ameta*, S. K. Sharma, R. B. Dubey and R A. Kaushik Rajasthan College of Agriculture, Maharana Pratap University of Agriculture and Technology, Udaipur, Rajasthan Introduction Cucumber (Cucumis sativus L.) is a warm season vegetable belongs to family cucurbitaceae. It grows throughout the world under tropical and subtropical conditions. It is said to be the native northern India [1]. Although its calorie and nutritional value is very low, it is a primary source of vitamins and minerals in the human diet [2]. In addition to its delicious taste, it has high medicinal value for human beings. It is well known for natural diuretic and thus can serve as an active drug for secreting and promoting flow of urine. The fruits of cucumber possesses various medicinal properties e.g. cooling effect, prevents constipation, checks jaundice and indigestion [3]. Due to high content of potassium (50-80 mg/100g), cucumber can highly be useful for both high and low blood pressures [4]. It is fast growing crop and compared with many crops, cucumber reaches harvest stage rapidly hence cucumber became most popular crop for poly house conditions. The cucumber fruit products are used not only for fresh eating and culinary cooking, but also for salad and pickling [5]. Cucumber is high yielding crop so it is responsive to fertilizers and organic matter. Humic substances are generated through organic matter decomposition and employed as soil fertilizers in order to improve soil structure and soil microorganisms [6], [7] and [8] found that humic acid promotes the uptake of N, P, Fe and Cu of tomato and other plants. The positive effect of humic acid on the uptake of N, P, Ca, Mg, Fe and Zn was also proved with corn plants [9]. Foliar sprays of these substances also promote growth, and increases yield and quality in a number of plant species [10] at least partially through increasing nutrient uptake, serving as a source of mineral plant nutrients and regulator of their release [11]. Likewise, humic substances have been shown to stimulate shoot and root growth and nutrient uptake of vegetable crops [12]. To elucidate the effects of humic substances, several hypotheses suggesting the formation of a complex between these substances and mineral ions, their involvement in the enhancement of enzyme catalysis, their influence of stimulating respiration, photosynthesis and nucleic acid metabolism, and their hormonal activity have been reported in carrot and higher plants, respectively, [13] and [14]. In this study, we determine the influence of exogenously applied humic acid (HA) and micronutrients on growth and yield of cucumber grown in a greenhouse. Abstract An experiment was conducted at Hi-tech unit of Rajasthan College of Agriculture, MPUAT, Udaipur, Rajasthan to study the response of growth and yield of poly house grown cucumber cultivar “Kian” (Cucumis sativus L.) to different applications of humic acid and micro nutrients. There were seven treatments of humic acid and micro nutrients applications. The experiment was laid out in completely randomized design with three replications during 2013-14. Analysis of variance showed significant differences for all the characters studied except specific gravity and moisture content. The maximum vine length (9.107 m), number of fruits (40.867), fruit length (18.303 cm), TSS (3.830 per cent) and total yield per vine (3.810 kg) were reported for treatment T 7 (RDF+ Humic acid 10 kg/ha + Humic acid 0.1% + micronutrient mixture) followed by treatments T 5 (RDF+ Humic acid 10 kg/ha + micronutrient mixture) having 3.710 kg yield and T 4 (RDF+ Humic acid 10 kg/ha + Humic acid 0.1 %) with yield of 3.520 kg per vine, whereas minimum yield (2.960 kg) was showed by RDF (control). Keywords: Cucumber, humic acid, polyhouse, yield, micronutrients *Correspondence Author: K D Ameta Email: kdameta100@yahoo.com