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Two field experiments were carried out at Ismailia Agricultural Research Station during 2011 and 2012 summer growing seasons to investigate the effects of applied N, P and K on peanut yield, quality and some macronutrients (N, P and K) uptake in sandy soils. Results showed that Ismailia-1 genotype surpassed Gregory genotype regarding plant growth, yield components and pod, seed quality except number of branches plant-1 and pod yield fed.-1 and N, P and K uptake in peanut seeds. Increasing N, P and K rates from (30-30-24 to 60-45-48kg NPK fed.-1) significantly increased plant height, number of branches plant-1 , seed weightplant-1 , pod yield fed.-1 ,100-pod weight, 100-seed weight, shelling % and N, P and K-uptake. Results also showed that the interaction among genotypes and nitrogen, phosphorus and potassium fertilization had significant effects on all studied traits in both seasons. Also pod yield (kg fed.-1) was positively correlated with all studied characters. Generally, Ismailia-1 genotype as well as (60,45and 48 kg NPK fed.-1) gave the highest values of most studied traits in the both seasons.

A field experiment was conducted at Shandaweel Research Station, Sohag Governorate during 2012 and 2013 seasons to investigate the influence of three water regimes at 100, 80 and 60% of field capacity, two sesame cultivars ( Shandaweel 3 and Sohag 2000 ) and six weed control treatments (Prometryn at rate of 375 g active ingredient (a. i) /fed. , bentazon at rate of 240 g a. i /fed., prometryn and bentazon with one hand hoeing, hand hoeing twice and weedy check) on water relations and sesame productivity. A split-split plot design with three replications was used. The results showed that irrigating sesame at 60 % of FC significantly reduced annual broad leaved, grassy and total weeds in both seasons compared to irrigation water at 100% of FC. While, irrigation at 100% of FC significantly increased growth and yields of sesame and its attributes compared to irrigation at 60 % FC. Sohag -2000 cultivar significantly inhibits growth of annual broad leaved, grassy and total weeds and increased plant height, number of branches and capsules /plant, capsule length, 1000-seed weight, seed yield and oil %, compared with Shandaweel-3 cultivar. All weed control treatments significantly reduced the dry weight of annual broad leaved, grassy and total weeds in both seasons. Hand hoeing twice, bentazon followed by H.H. once, + prometryn follow by H.H. once, gave the highest reduction % in the total annual weeds and increased significantly plant height, the number of branches / plant, number of capsules /plant, capsule length, 1000 seed weight, seed yield /fad. and oil %, compared to un-weeded treatment. Water consumptive use (CU) values were 2252.6, 2016.1, 1656.9, 2261.7, 2020.4 and 1654.2 m 3 /fed for 100, 80 and 60 % of FC treatment , respectively, in both seasons. The highest value of water use efficiency (WUE) was recorded by irrigation at 80 % of FC. The highest CU and WUE were recorded by Sohag -2000 cultivar, compared to Shandaweel-3 cultivar. Under the conditions of this experiment sowing Sohag-2000 cultivar with using hand hoeing twice, bentazon followed by H.H. once, and prometryn followed by H.H. once and irrigation at 80 % of FC can be recommended to obtain the highest oil and sesame yield/fed.

The present study aimed to estimate different stability statistics to evaluate the behavior of some sesame genotypes grown under12 diverse environments in four successive summer seasons of 2011, 2012, 2013 and 2014. Forteen sesame genotypes, in addition to one check cultivar, were planted in three locations of upper Egypt, [Shandaweel (Sohag), El-Mataana (Luxor) and Mallawi (Elmenia)]. The design used was randomized complete blocks design with three replications as well as using four stability methods [Eberhart and Russell (1966), Tai 1971, shukla (1972 and Kang and Magari (1995)]. The studied characters were plant height, length of fruiting zone, number of capsules/ plant,1000 seed weight, seed weight/plant (g) and seed yield (ardeb/fed). Results indicated that the genotypes significantly differed for all the studied traits. Also genotype x environment (GxE) interaction was highly significant for all the studied traits. Genotype No.12 (N.A.653) was phenotypically and genotypically stable using the three stability procedures of Eberhart and Russell (1966), Tai (1971), and Kang and Magari (1995) for plant height. Considering fruiting zone length, genotype No. 4 (B21) was stable using the three stability methods while the genotype No. 6 (N.A. 463) was stable for number of capsules/ plant using the same three methods of stability. Concerning 1000 seed weight, genotype No. 6 (N.A. 463) was stable by using Shukla (1972) and Kang and Magari (1995) methods of stability. The results revealed that genotype No. 5 (Hybrid167), No. 10 (N.A.542) and No.12 (N.A.653) for seed weight/plant, and genotypesNo.4 (B21), No.5 (Hybrid167) and No.10 (N.A.542) for seed yield (ardab/fed), were stable by using two methods of stability Eberhart andRussell, 1966 andMagari, 1995 . In light of the current results, it can be concluded that genotype No. 5 (Hybrid167) may be recommended to be released as a commercial stable genotype for seed weight/plant (g) and seed yield (ardab/fed) by using two methods of stability (Eberhart and Russell (1966) and Kang and Magari (1995), and incorporated to be as a breeding stock in any future breeding program.