In India, among nonedible oilseed crops, linseed is a commercial crop having tremendous economic and industrial importance. The seed production is low due to limited resources, so the development of high-yielding lines with desirable characters is urgently needed. In the present study seven parents' half diallel data was subjected to biplot analysis to identify the heterotic crosses, genetically similar parents, and to study their interrelationship. Parent Sln-Ys with A-79 and A-03 with A-79 for capsules per plant and seed yield, parent Mukta with Sln-Ys and Mukta with BAU-45 for seeds per capsule, and parents Mukta, A-103, A-79 and A-94 for test weight had lowest correlation. Parent B [Mukta] and F [A-79] were good general combiner for all the traits. The crosses F [A-79]？？ ？？A [Sln-Ys] and D [A-03]？？ ？？F [A-79] for capsules per plant, test weight and seed yield per plant, cross D [A-03]？？ ？？A [Sln-Ys] for capsules per plant and test weight and cross D [A-03]？？ ？？F [A-79] for test weight and seed yield per plant were heterotic. None of the crosses were heterotic for seeds per capsule. 1. Introduction In terms of production and value, oilseed crops are second major agriculture crops next to food grains in India. Linseed (Linum usitatissimum L.) is an oldest domesticated and economically important industrial nonedible oilseed crop which is being cultivated for seed and its fiber since centuries [1]. The whole plant has commercial use directly or indirectly and also has capability to substantiate the existing natural demand of oil. The crop is generally cultivated under marginal and rain-fed conditions [2]. The area under cultivation is approximately. 1.9 million hectares in India. The average seed yield of linseed in India is 403？Kg/ha which is comparably very low in comparison with world average seed yield that is 943？Kg/ha [3–5]. The low seed yield is chiefly due to limited resources available to poor farmers along with nonavailability of high-yielding cultivars [6]. So, the development of high-yielding varieties/lines is needed to compete with other linseed growing countries. Such lines/varieties can easily be developed through suitable hybridization and selection programmes to isolate superior segregants [7]. However, the success of any hybridization programme chiefly depends on combining ability of parents used in crossing programme [8]. Combining ability provides an important tool for selection of desirable parents and to get required information regarding the nature of gene action controlling desirable trait [9]. Generally, plant breeders use
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