Mechanically post-harvest puddled rice field has stubbles that often delay timely planting of winter wheat crop. Zero tillage increased the net return by decreasing the unwise tillage operations and labor charges. Keep in view, a randomized complete block design experiment in a split plot arrangement was conducted with four tillage system [conventional tillage, CT; deep tillage, DT; zero tillage with zone disc tiller, ZDT; and happy seeder, HS] in main plots and five nitrogen levels [0

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C otton (Gossypium hirsutum L.) plant is recognized as white gold and warm humid area of the world under its cultivation (Meredith et al., 1997). In the world, Pakistan ranked 3 rd being a consumer and fourth in terms of production (GoP, 2015-16). It has a leading role in Pakistan's economy as a main cash crop.Moreover, foreign exchange earnings and support about 1.5 million rural economies (Hussain et al., 2010;Ahmad et al., 2009). Cotton crop share in value addition is 5.1 % and in gross domestic production is 1.0% (GoP, 2015-16). Recent economic importance of cotton is 2.917 million hectares' areas with total production and average yield are 10.074 million bales and 587 kg per hectare, respectively (GoP, 2015-16).

Background: The possibility of selecting the best genotypes to develop good hybrid varieties of tomatoes, as well as heterosis, potence ratio and correlation of vegetative characteristics, yield and quality in tomato genotypes and their performance under arid region.Methods: Four commercial tomato cultivars (Money Maker, Pakmore VF, Strain-B and Tanshet Star) and two breeding lines (L05960 and TL01899) and their 15 F1 hybrids, using a half-diallel cross, under arid conditions were used to estimate heterosis, potence ratio and correlation coefficients among all possible pairs of important tomato traits.Result: various degrees of dominance effects for some traits were detected in the general performances of the F1 hybrids, while, other traits illustrated the presence of partial- to under-recessiveness. Heterosis percentages reflected positive desirable effects in ten F1 hybrids for some traits. Most F1 hybrids outperformed their respective parents for fruit set, fruit length, fruit diameter, total soluble solids, fruit dry weight, number of fruits per plant and total fruit yield per plant. Some of the genotypes (i.e., parents and/ or hybrids) offer opportunities as a genetic source of heat tolerant breeding genetic material adapted to high temperature under the arid conditions reported in this study. Significant positive and desirable correlations were found between 41 possible pairs of traits, whereas significant negative and undesirable correlations were found between 13 possible pairs of the traits.