Effect of Nitrogen Levels and Growth Retardants on Cotton Under High Density Planting System

Aims: To determine the optimum irrigation schedule and nitrogen level for Bt cotton in alfisols in Southern Telangana.
 Study Design: Split plot design.
 Place and Duration of Study: ARI, Rajendranagar, Hyderabad during kharif 2014.
 Methodology: The experiment was laid out with three irrigation schedules (I1- 0.8 IW/CPE, I2 - 0.4 IW/CPE and I3 - Rainfed) as main plots and four nitrogen levels (N1- 0 kg ha-1, N2 - 75 kg ha-1, N3 - 150 kg ha-1 and N4 - 225 kg ha-1) as sub plot treatments replicated thrice. Treatments imposed as per the schedule and data recorded on yield, yield attributes, nitrogen uptake by adopting standard procedures
 Results: Irrigation at 0.8 IW/CPE recorded significantly higher plant height (79 cm), drymatter at first picking (195 g plant-1), bolls plant-1 (16), seed cotton yield (1435 kg ha-1), lint yield (541 kg ha-1), stalk yield (2057 kg ha-1) and nitrogen uptake (63 kg ha-1) and was not differed significantly with 0.4 IW/CPE and these were significantly superior to rainfed cotton. Among nitrogen levels, significantly higher plant height (90 cm), drymatter at first picking (214 g plant-1) stage, days to reach boll development (90) stage, bolls plant-1 (15), boll weight (5.3 g), seed index (9.9 g), seed cotton yield (1435 kg ha-1), lint yield (547 kg ha -1) and stalk yield (2214 kg ha -1) were found with application of nitrogen at 225 kg ha-1 was comparable with 150 kg N ha-1 and were significantly superior over lower levels of nitrogen application. The substantial increase in yield and yield attributes might be due to favorable effect on growth attributes like plant height, increased bolls plant-1, drymatter accumulation plant-1 and its subsequent translocation towards sink improved the seed cotton yield.
 Conclusion: It can be concluded that, higher seed cotton yield can be obtained with the irrigation scheduled at 0.4 IW/CPE and application of nitrogen at 150 kg ha-1 in Bt cotton grown in alfisols.

Increased plant density promotes taller growth and greater vegetative development, intensifying competition among plants for resources and consequently affecting the balance between the vegetative and reproductive stages of the cotton plant. To ensure improved square development, boll development, boll retention, and seed cotton yield under dense planting condition, this research was conducted at the Cotton Research Station, Veppanthattai. The study aimed to evaluate the effects of plant growth regulators (PGR) and foliar nutrition on the growth, yield, and fibre quality of compact cotton varieties suitable for dense populations and mechanical harvesting. The results revealed that the application of mepiquat chloride (100ppm at 45 and 60 DAS), NAA (40ppm at 60 and 90 DAS), KNO3 (2% at 60 and 90 DAS), calcium borate (0.5% at 60 and 90 DAS), and a defoliant (Thidiazuron 240 g/L and Diuron 120 g/L at 200 ml/ha at the 60% boll bursting stage) achieved optimal growth attributes. These included plant height (98.7 cm), the number of functional leaves (07), leaf area index (3.9), seed cotton yield (2351 kg/ha), stalk yield (3286 kg/ha), lint yield (933 kg/ha), and harvest index (0.69), along with improvements in fiber quality parameters. In this study, potassium facilitated the efficient translocation of photosynthates from leaves to reproductive organs, contributing to enhanced biomass accumulation and yield.

A field experiment was conducted during the rainy (kharif) seasons of 2018 and 2019 at Sardarkrushinagar, Gujarat, to study the productivity enhancement of Bt cotton (Gossypium hirsutum) grown under high-density planting system using mepiquat chloride. The experiment was laid out in split-plot design, with planting density in main plots and mepiquat chloride treatments in subplots. Pooled data of 2 years revealed that, Bt cotton grown with lower plant density (37,037 plants/ha) recorded significantly higher sympodial branches/plant, sympodial length at 50% height, number of bolls/plant and average boll weight, while high-plant density (74,074 plants/ha) resulted in the maximum seed-cotton (3,544 kg/ha) and stalk yield (3,740 kg/ha) as well as net realization (79.1 103 `/ha). The magnitude of increase in seed-cotton yield owing to higher plant density over lower plant density was 68.53%, on pooled basis. Application of 3 sprays of mepiquat chloride @ 0.4 ml/litre (one each at 45, 60 and 75 days after sowing) resulted in the least growth parameters, viz. plant height, dry-matter accumulation, crop-growth rate, relative growth rate and stalk yield with a highest yield attributes, viz. sympodial branches/plant, sympodial length at 50% height, bolls/plant, average boll weight, seed-cotton yield (3,186 kg/ha) and net realization (66.8 103`/ha). Three sprays of mepiquat chloride @ 0.4 ml/l at 45, 60 and 75 days after sowing resulted in 28.8% higher seed-cotton yield than control treatment in pooled mean

The main objective of the present investigation is to obtain wide genetic variation by using lee it tester analysis involving two seeded testers as male parents, namely, AugUraliall and Karashnelry and four Egyptian cotton culbvars as females (lines) namely Gza80, Giza85, Gza90 and Gia87 (G.barbadense). Eight Ft's, the two tester varieties and the four lone cultivars were grown in a randomized complete block design with three replications in 2006 season to evaluate combining abilities and nature of gene action. Genotypes mean squares were highly significant for all traits except for int percentage (L %), lint index (LI) and uniformity index (U.I). Parents mean squares revealed highly significant differences for all studied traits except for lint percentage (L %) and ant index (U). Higher estimates of dominance (02d) variance than additive valance (02A) were recorded and low narrow sense heritability values (h%n.$) and low magnitude of the ratio Q2gCa/Q25ca (less than unity) were found for first fruaing node (FFN), seed cotton yield (KY), lint yield (LY), lint percentage (1%), seed index (SI), lint index (U), micronalr value (Nie), plessly index (PI) and Upper half mean (U.H.M). On the other hand days of first flower (DFF), boll weight (8W) and uniformity index (U.I) recorded lion estimates of additNe variance (02A) and narrow sense heritability (h%n.$). For the testers, Australian and Karashneky varieties were good combiners for first fruiting node (FFN), days of first flower (OFF), seed cotton yield (SCY), lint yield (LY) and uniformity index (VI). Among female parents the variety Giza85 was the best combiner for days of fist flower (OFF), seed cotton yield (SCY), lint yield (LY), seed index (SI) and uniformity index (MI). Giza87 was the best general combiners for fiber traits. Gza90 was the best general combiner for boa weight (avo, seed index (SI) and uniformity index (U.I). Gza80 was the best combiner for first fruiting node (FIN), days of first flower (OFF), boll weight (BW), seed talon yield (SCY), ant yield (LY), micron* value (Mic) and con* index (F1). It oduld be concluded that (tie hybrid (Australian it Giza85) and (Karashneky it Gza85) may be used for the improvement of seed cotton yield (SCY), lint yield (LT), seed Index (SI) and Upper half mean (URA), while (Australian it Gza80) and (Karashneky x Gza80) hybrids were the best for the Improvement of seed cotton yield (SCY), lint yield (1Y) and pressty Index (PI).

Dataset of source-sink manipulation through growth retardant for enhancing productivity and profitability of cotton in north west, India.

Mepiquat chloride (MC) is a plant growth regulator used to manage the rampant vegetative growth of cotton. A two-year field experiment was conducted at the Postgraduate Agricultural Research Station, University of Agriculture, Faisalabad, Pakistan, during 2017 and 2018 to investigate the influence of MC applied at different times on phenology, morphology, lint yield and quality of cotton cultivated using different sowing techniques. MC was applied 50 days after sowing (DAS), 60 DAS and 70 DAS to cotton planted in flat fields (flat sowing), ridges (ridge sowing) and beds (bed sowing). The interactive effect of MC application time and sowing technique did not influence crop phenology, morphology, and lint yield and quality. It was revealed that the crop planted on beds took fewer days to flower (10%) as compared to that on the flat field, and the bed-sown crop produced a higher number of opened bolls (60%) and was characterized by a higher boll weight (32%) and seed cotton yield (50%) in comparison to the flat-sown crop. A late application of MC (at 70 DAS) caused a significant reduction in the time to flowering (8%), with a simultaneous increase in the number of opened bolls (60%), boll weight (32%), ginning out turn (8%) and lint yield (27%) as compared to MC application at 50 DAS. In terms of lint quality, cotton planted on beds had better fiber uniformity (8%) compared to that on the flat field, while MC applied at 70 DAS produced better fiber fineness by 27% in comparison to MC applied earlier. Overall, cotton planting on beds and MC application at 70 DAS may help improve cotton yield and fiber quality and may help in the mechanical picking of cotton.

We aimed to investigate the effects of some seed priming and foliar applications on stress prevention in cotton under deficit irrigation conditions. Seed priming with mepiquat chloride (PIX) and foliar applications of salicylic acid (SA) and proline (PRO) were tested at three levels of irrigation at 25, 50, and 100% of field capacity. Plant height, boll number, fiber length and fiber strength were significantly affected by the interaction of irrigation level × treatment. The effects of irrigation level and treatment were significant for boll weight, seed index, seed cotton yield and lint yield. When deficit irrigation conditions (25%) were compared with full irrigation, plant height decreased by 21.6 %, boll number by 18.1 %, boll weight by 26.0%, seed index by 5.8%, seed cotton yield by 25.6% and lint yield by 24.6%. Seed priming with PIX and foliar application of PRO produced significantly higher seed cotton and lint yields, whereas SA application had favourable fiber quality parameters under deficit irrigation conditions. PRO slightly increased fiber fineness. Foliar application of SA positively affected chlorophyll content (SPAD) and leaf area index (LAI) under deficit irrigation. In conclusion, it was recommended that all three practices could be successfully used to alleviate negative impacts under deficit irrigation conditions.

Two experiments were carried out at Sakha Agriculture Research Station, Cotton Research Institute, Agriculture Research Center, Egypt. The aim of this investigation was to study heterosis and combining ability for the most important traits of cotton (boll weight, seed cotton yield, lint yield, lint percentage, number of bolls per plant and seed index). Eight cotton genotypes 10229 x G.86, G.45, Pima S1, Suven, TNB, CB.58, G. 70 and G. 93 were crossed in half diallel mating design in 2011 season to obtain 28 single crosses. These parents and their respective 28 F1 crosses were evaluated in two planting dates (April and May) in a randomized complete blocks design in 2012 season. The results obtained could be summarized as follows:- 1- Highly significant mean square values were obtained for genotypes, genotypes x dates, parents x dates, crosses x dates for all the studied traits. 2- The best general combiner for most of studied traits was parent (10229 x G. 86). Also the best general combiners for most of studied traits were crosses (10229 x G. 86) x Pima S1, G.45 x G.70, CB.58 x G.70 and CB.58 x G.93 3- The parent (10229 x G. 86) had the best general combining ability for boll weight, seed cotton yield, lint yield and lint percentage under two sowing dates and their combined. 4- The crosses CB.58 x G.93 and G.45 x G.70 showed highly significant desirable specific combining ability for boll weight, seed cotton yield, lint yield and number of bolls per plant at two sowing dates and their combined. 5- Positive heterotic effects relative to the mid-parent were found for most of the traits in the crosses (10229 x G.86) x G.45, G.45 x Suven, G.45 x G.70, TNB x G.70 and C.B 58 x G.93. Also positive heterotic effects relative to the better parent were found for most of the traits in the crosses (10229 x G.86) x TNB, G.45 x Suven and G.45 x G.70 over two planting dates and their combined. 6- Dominance effects were important in the inheritance of boll weight, seed cotton yield and number of bolls per plant traits. The additive gene effects contribute the major portion of gene pool for lint yield, lint percentage and seed index traits. 7- Heritability estimates in narrow sense were low to high for all the studied traits, ranged from 32.17% for seed cotton yield to 91% for boll weight for the combined data. 8- From these results it could be concluded that the crosses CB.58 x G.93 and G.45 x G.70 appeared to be promising for late-planted tolerance therefore could be exploited in breeding program aiming to improve late-planting tolerance.

Chemicals may be used to reduce plant size in cotton (Gossypium barbadense L.), which can increase cotton yield by allowing an increased number of plants per unit area. Foliar sprays of growth retardants Cycocel and Alar were applied at concentrations of 250, 500, and 750 ppm 105 days after planting (square and boll setting stage) to Egyptian cotton cultivar Giza 75 planted at three plant densities (166,000, 222,000, and 333,000 plant ha−1). The objectives of this two-year study were to determine if growth retardants may be substituted for plant density, and vice versa, and to investigate their effects on yield and fiber properties. Number of opened bolls plant−1, seed-cotton yield plant−1, and earliness increased as plant density decreased in both years, as did seed-cotton and lint yield ha−1 in the second season. In the first year, the intermediate plant density gave the highest yields. Plant density had no significant effect on lint percentage or fiber properties. Both Cycocel and Alar increased the number of opened bolls plant−1, boll weight, seed and lint indices, seed-cotton yield plant−1, and both seed-cotton and lint yield ha−1, but effects were not always significant and response varied for different traits. Neither Cycocel nor Alar affected lint percentage, yield earliness, or fiber properties at any plant density. The interaction of plant density × growth retardant was significant for the number of opened bolls m−2 and plant−1, seed-cotton yield plant−1 and ha−1, and for lint yield ha−1. The lowest plant densities, combined with application of Cycocel or Alar, gave the highest number of opened bolls m−2 and plant−1, seed-cotton yield plant−1 and ha−1, and lint yield ha−1. This implied that the effect of growth retardants on cotton yield depended essentially on the number of plants per unit area or space available to each plant and that applying growth retardants could enhance the effect of low plant density.

A field trial to determine the effect of different dosages, Scheduling time of plant growth regulators and defoliators on growth and yield of cotton under high density planting system was conducted at Regional Agricultural Research Station, Warangal during kharif-2022. The experiment consisted of eleven treatments laid out in Randomized Block Design with three replications. The treatment details were T1: Application of Mepiquat chloride (M.C) 25 g a.i ha-1 @ 40 & 55 DAE + Ethereal 2000 ppm @ 40 % boll burst, T2: M.C 25 g a.i ha-1 @ 40 & 55 DAE + Ethereal 2000 ppm @ 60 % boll burst, T3: M.C 20, 30 g a.i ha-1 @ 40, 55 DAE respectively + Ethereal 2000 ppm @ 40% boll burst T4: M.C 20, 30 g a.i ha-1 @ 40, 55 DAE respectively + Ethereal 2000 ppm @ 60% boll burst T5: M.C 20 g a.i ha-1 @ 40,55 & 75 DAE+ Ethereal 2000ppm @ 40 % boll burst, T6: M.C 20 g a.i ha-1 @ 40, 55 & 70 DAE + Ethereal 2000 ppm @ 60 % boll burst, T7: M.C 25 g a.i ha-1 @ 40, 55 & 70 DAE + Ethereal 2000 ppm @ 40 % boll burst, T8: M.C 25 g a.i ha-1 @ 40, 55 & 75 DAE+ Ethereal 2000ppm @ 60% boll burst, T9: M.C 20, 25, 30 g a.i ha-1 @ 40, 55 and 70 DAE respectively + Ethereal 2000 ppm @ 40 % boll burst, T10: M.C 20, 25, 30 g a.i ha-1 @ 40, 55 and 70 DAE respectively + Ethereal 2000 ppm @ 60 % boll burst and T11: Control .(Water spray at 40, 55 and 70 DAE). Results revealed that foliar application of M.C @ 20 g a.i ha-1 @ 40, 55 & 70 DAE in conjunction with Ethereal 2000 ppm @ 60% boll burst recorded higher seed cotton yield. Plant growth, dry matter accumulation and stalk yield were recorded highest in control plot and lowest with spraying of M.C 20, 25 and 30 g a.i ha-1 @ 40, 55 and 70 DAE respectively + Ethereal 2000 ppm @ 40 % boll burst. Among similar doses of Mepiquat chloride, all the agronomic traits of cotton crop are positively influenced with application of 2000 ppm Ethereal @ 60% boll burst. The spraying of M.C @ 20 g a.i ha-1 at 40, 55 and 70 DAE + Ethereal 2000 ppm @ 60% boll burst would be economically ideal to the farming community.

An experiment was executed during Kharif 2021 at Regional Agricultural Research Station, Lam, Guntur in randomized block design (RBD) in two replications for estimation of combining ability of the parents and gene effects and also the extent of heterosis using line × tester fashion design. Statistical data were collected on the biometrical observations viz., days to 50% flowering, plant height (cm), number of monopodia/ plant, number of sympodia/plant, number of bolls per plant, boll weight (g), seed index (g), lint index (g), Ginning Out Turn (GOT %), seed cotton yield (kg/ha) and lint yield (kg/ha). The lines GISV298 and SCS1207; the testers, Lam GPC 501 and Lam GPC 355 exhibited positive General Combining Ability (GCA) effects for the traits Ginning Out Turn (GOT%), Seed Cotton Yield (SCY) and Lint Yield (LY) signifying that these were good general combiners. The cross combinations viz., TCH1837/GP117, GISV298/GP274, and SCS1207 / GP117 expressed significant specific combining ability (SCA) effects for Seed Cotton Yield (SCY) and Lint Yield (LY). The cross combination, SCS1207/ Lam GPC 355 was identified as the best hybrid combination with high GCA and SCA for important traits like GOT, seed cotton yield, and lint yield coupled with significant positive heterosis which can be further tested in multi-location testing at the station and all India level.

The field experiment was carried out at the Central Farm, AC &RI (Agricultural College and Research Institute), TNAU, Madurai, Tamil Nadu during Kharif season 2024. The study aimed to evaluate the effects of different nutrient management strategies on the growth, yield components and productivity of coloured cotton. The experiment followed a randomized block design (RBD) with nine treatments based on nitrogen equivalence, incorporating different organic manures in comparison to inorganic fertilizers, with each treatment replicated three times. The results revealed that growth parameters such as plant height, dry matter production, leaf area index, chlorophyll content, number of monopodial branches plant-1 , days to 50% flowering and days to 50% boll bursting were significantly enhanced by the application of 100% NPK based on site-specific recommendation (T2), which statistically at par with 100% NPK through blanket recommendation (T1). Yield attributes including number of fruiting branches plant-1 , number of fruiting points plant-1 , number of bolls plant-1 , number of bolls m-2 , boll setting percentage and boll weight, along with seed cotton yield, lint cotton yield, stalk yield and biological yield, which also showed a significant increase with the application of 100% NPK through site-specific recommendation (T2). Organic treatments, including the complete organic package (T9), cover cropping with 75% N through vermicompost (T4) and cover cropping with 75% N through poultry manure (T5), exhibited comparable results to inorganic treatments. Future research should focus on optimizing organic nutrient management strategies and integrating cover crops to enhance soil health and ensure sustainable cotton production.

Comparative studies for thirty eight genotypes descending from twenty one crosses and the two check varieties Giza 90 and Giza 80 were included in Trial A at Seds Agricultural Experimental Station in 2012 season, eighteen genotypes descending from sixteen crosses and the two check varieties Giza 90 and Giza 80 were grown in Trial B at five locations in Middle and Upper Egypt in the same season. The results obtained from Trial A showed that the strains H5118/2011 and H5124/2011 of the cross (G 83 Rad. x Aust.) x G 91, H5128/2011 and H5129/2011 cross [(G 80 x Aust) x G 83], H5150/2011 cross (G 83rad x Kar) x [(G 83 x G 80) x G 89], H6198/2011 cross[[(G 83 x G 80) x G 89] x (G 83 x Delta Pine)]], H7215/2011 cross [(G 83 x G 80) x G 89] x Aust, H8238/2011 cross (Dand. Rad x Karsh), H9244/2011cross [G 90 x Pima S62 (24240)], H9253/2011 cross [G 91 x Pima S62 (24240)], H10268/2011 [G 83 x (G 72 x Dand.) x G 91], H11281/2011[G 83 x (G 72 x Dand.) x G 85] and Breeder1 of the promising cross [G 83 x (G 72 x 5844)] x G 80] recorded significant higher seed cotton yield (SCY) and lint cotton yield (LY) compared with the check varieties Giza 90 and Giza 80. While the crosses [(G 85 x G 83) x G 90], [(G 83 x G 80) x G 89] x Aust, C.B 58 x G 90, H8249/2010 descending from the crosses G 91 x Pima S62 (24202), [G 83 x (G 75 x 5844) x G 91], [(G 83 x G 72) x Dand] x G 85 respectively and breeder2 of the promising cross (Giza90 x Aus) had higher seed and lint cotton yield (SCY and LY) compared with the check varities Giza 90 and Giza 80 in Trial B. The mean squares of the genotypes in Trial A were highly significant for all yield components traits. Combined mean squares results in Trial B of the genotypes (G) were highly significant and significant for all yield traits except for lint index (LI). Environments (E) mean squares were highly significant for all studied yield traits. Genotypes-environments interactions (G x E) mean squares were highly significant for all yield traits except for lint percentage (L%) which showed significant combined mean squares, indicating change in performance of genotypes from one location to another. In other words, the rank of a genotype differed from one location to another. High heritability estimates in broad sense (h.b.s %) were computed for all yield traits in Trial A, indicated that the environment had slightly influence on these traits. Broad sense heritability estimates (h.b.s %) for yield traits in Trial B were low for seed cotton yield (SCY), lint yield (LY) and boll weight (BW), indicated that the environmental factors had effect on these traits. On the other hand, lint percentage (L %), seed index (SI) and lint index (LI) recorded high heritability estimates in broad sense (h.b.s %) (more than 50%), indicating that environment had considerable effect on these traits.. The G.C.V % values ranged from 2.54% for lint index (LI) to 61.65% for lint yield (LY) in Trial A and ranged from 3.98% for lint percentage (L %) to 50.0% for lint yield (LY) in Trial B. These values indicated variable environmental effects on all studied traits.

Cotton acreage in the Coastal Plain of the Southeast has increased in recent years. The soils in this region are sandy and typically have a low retention capacity for sulfate S. A 3-yr (1993-1995) field test was conducted in south Alabama on a Lucy loamy sand (loamy, kaolinitic, thermic Arenic Kandiudults) to evaluate the response of cotton (Gossypium hirsutum L.) to the source, rate, and timing of S fertilizer applications. Sulfur was broadcast preplant as either ammonium sulfate, elemental S, potassium sulfate, potassium thiosulfate, or K-Mg-sulfate at rates of 0, 10, 20 and 40 lb S/acre. Additionally, ammonium sulfate was applied at first square to evaluate timing effects. Lint yields were increased each year and they peaked at a rate of approximately 20 lb S/acre on this Lucy Is soil. Averaged across sources, 20 lb S/acre increased lint yields by an average of 21% as compared with the no S check treatment. Lint yields were not affected by time of S application in 1993 or 1995, but a preplant application of S increased yield compared with S applied at first square in 1994. The response to time of S application was attributed to heavy rainfall that was received soon after the first square application of S. Sources of S did not affect lint yield in 1993 or 1995, but ammonium sulfate and K-Mg-sulfate produced slightly higher yields than those of other sources in 1994, an extremely wet growing season. Lint quality, as measured by high volume instrumentation (HVI), was not affected by any S treatment in 1993 or 1994. In 1995, fiber length increased with S rate, but the differences among sources were inconsistent. Results of this test suggest that cotton produced on sandy Coastal Plain soils that are low in S may require annual applications of 20 lb S/acre to ensure high yields. The S should be applied preplant, although delaying application to first square should not limit yields. For lint production, differences among commercial S fertilizer sources should be minimal.

Tow field experiment, were conducted at El-Serw Agricultural Experiment Station, Damietta Governorate, to study the effect of phosphorus fertilizer levels ( 0, 15, 30 and 45 kg P2O5/fed.), potassium fertilizer levels (0, 24, 48 and 72 Kg K2O/ fed.) and their combinations on cotton plant. Vegetative samples from the first full mature leaf were taken just preflowering to determine N, P and K concentrations. Some yield components (number of open bolls /plant, boll weight, seed plant index and oil with lint percentages) and cotton yield (seed cotton yield, seed yield, lint yield and oil yield) were determined. Obtained results can be summarized as follows: 1- Phosphorus or potassium application increased significantly nitrogen, phosphorus and potassium concentrations in cotton leaves , while combination with each other did not significantly. 2- Number of open bolls/ plant , boll weight , seed index , oil percentage lint percentage ,seed cotton yield, seed yield, lint yield and oil yield were increased significantly by phosphorus or potassium application either alone or in combination with each other in both the two seasons ,while number of open bolls /plant was not affected significantly in the second season. The highest rate of phosphate (45 Kg P2O5 /fed.) and potassium (72 Kg K2O/ fed.) recorded the maximum responses. 3- No significant differences were found between the highest two rates of P and K fertilizer on the above mentioned measurements. 4- Lint and oil percentages were correlated significantly with nitrogen , phosphorus and potassium concentrations. 5- It is concluded that application of (65 Kg N/ fed. + 30 Kg P2O5/fed.+48 Kg K2O/fed.) was the best treatment for cotton grown in salt affected soils in the north of Delta.