Chilli (C. annuum and C. frutescens) is one of the most important spice crops in Bangladesh as well as in the world. The genotypes of chilli under investigation showed considerable variation in most of the characters. The best dose of NPK per hectare were 100, 60, 100 or 125, 60, 100, respectively as in most cases these doses gave the best result for obtaining the maximum yield and these two doses were identical in most of the cases. 125 kg N, 60 kg P and 100 kg K was the best dose for getting highest gross return, net return and BCR and this dose was also identical to 100 kg, 60 kg and 100 kg per hectare NPK, respectively. The best dose of S, Zn and B per hectare was found to be 20 kg, 3 kg and 1.5 kg, respectively for getting the highest yield and highest BCR. To get the highest seed yield 100 kg N, 60 kg P and 100 kg K per hectare along with 20 kg S, 3 kg Zn, 2 kg B per hectare were found the best dose.

Bangladhonia (Eryngium foetdum L.) is a highly priced aromatic and medicinal culinary herb increasingly cultivated world wide. Seed - its production, rapid viability degradation and low germination rate limits its dissemination and cultivation. Experiments were conducted by the author at the Horticulture Field Laboratory of BSMRAU, Bangladesh to study morphology, fresh herb and seed production potentiality, seed storage and viability improvement. The dissertation includes method of Eryngium cultivation, morphological study, fresh herb and seed production, seed storage, viability and germination enhancement using growth regulators with different plant spacing. The highest seed yield (136.3kg/ha), gross return(BD Tk. 0.75 million/ha) and BCR (4.76) was recorded in 10x10 cm plant spacing. Seed treated with growth regulator solution (GA3 500ppm + Kinetin 50ppm) gave the maximum germination (31.23%), fresh yield (55.90 t/ha), gross return (BD Tk. 1.37 million/ha), gross margin (BD Tk. 1.18 million/ha) and BCR (8.52) with 20 kg seed/ha in broadcasting sowing system. Low temperature (4-5 deg.C) storage with air tight sealed polyethylene bag packaging was found better for storage of seeds.