Emerald Harvest Bloom Research Dossier


Emerald Harvest Bloom

Harvest the best from your grow room with Emerald Harvest Bloom base nutrient formulated especially for your high-value crops. The product supplies plants with precise ingredients that deliver the right amount of Nitrogen, Phosphorous, and Potassium throughout the crop cycle.

Key Ingredients

Monopotassium Phosphate, Potassium Sulfate, Magnesium Sulfate


Monopotassium Phosphate

  • Preferred source of Phosphorous and Potassium when Nitrogen fertilization should be limited.
  • Increases sugar content
  • Improves the quality of harvest
  • Potassium affects flower formation
  • Higher female flower production.
  • Essential for root development
  • Greater marketable fruit number.

Potassium Sulfate

  • Growth in quality of produce
  • Increases the concentrations of total sugar, total soluble solids, glutamic acid, aspartic acid, alanine, and volatile acetate components
  • Potassium has been shown to affect both flower number and fruit formation, giving the greatest number of flowers.
  • The plants with lower K supply soluble amino acids accumulated whereas in the “+K” plants the incorporation of amino nitrogen into the protein fraction was accelerated.
  • Leaf area index increased with concurrent increase in potassium levels.

Magnesium Sulfate

  • Increases yield and quality
  • Essential for photosynthesis
  • Shortage of Mg causes reduced growth and severe yield reduction.
  • Without the magnesium, the chlorophyll molecule falls apart, and light energy is not captured in photosynthesis.


Monopotassium Phosphate

Potassium affects flower formation- Bare-root, vegetatively propagated plants (average 15-cm leaf spread) of a white-flowered Phalaenopsis Taisuco Kochdian clone planted either in a mix consisting of three parts medium-grade Douglas fir bark and one part each of perlite and coarse Canadian sphagnum peat (by volume) or in Chilean sphagnum moss.All plants were given 200 mg L each of nitrogen and phosphorus, 100 mg L calcium, and 50 mg L magnesium at each irrigation with 0, 50, 100, 200, 300, 400, or 500 mg L potassium (K). After eight months, K concentration did not alter the number of new leaves on plants in either medium. In moss, plants had increasingly longer and wider top leaves as K concentration increased. The lower leaves on plants in the bark mix lacking or receiving 50 mg L K showed symptoms of yellowing, irregular purple spots, and necrosis after spiking and flowering, respectively. Symptoms became more severe during stem development and flowering. All of the plants lacking K were dead by the end of flowering. K at 50 mg L significantly reduced and 100 mg L completely alleviated the symptoms of K deficiency at the time of flowering. However, by the end of flowering, plants receiving 50 or 100 mg L K had yellowing on one or two lower leaves. Plants grown in moss and lacking K showed limited signs of K deficiency. All plants in the bark mix bloomed, whereas none in sphagnum moss receiving 0 mg L K produced flowers. For both media, as K concentration increased, flower count and diameter increased. Flower stems on plants in either medium became longer and thicker with increasing K concentration. To obtain top-quality Phalaenopsis with the greatest leaf length, highest flower count, largest flowers, and longest inflorescences, it is recommended that 300 mg L K be applied under high N and high P conditions regardless of the medium:

Yin-Tung Wang, 2007. Potassium Nutrition Affects Phalaenopsis Growth and Flowering. Hortscience, Volume 42, Issue 7, pp. 1563–1567.

The effect of K nutrition on the growth in sand culture of young tomato plants, cv. Amberley Cross, was examined and the concentrations of K in the nutrient feed and in the leaves associated with maximum flower number, fruit set and yield were determined. The distribution of K between and with-in fruit trusses of normal and K-deficient plants, cv. Amberley Cross and Moneymaker grown in peat/loam was also studied. Total dry weights of 6-wk-old plants grown in sand were maximal when the nutrient feed contained 0.53–5.03 me K+/l, although plants receiving 10.23 me K+/l retained more water in the foliage and therefore had the greatest foliage fresh weight. Both peduncle length and height of the basal truss were increased by K in the feed up to 10.23 me/l, the highest concentration used. Flower development was retarded below 0.53 me K+/l, and fruit setting efficiency was reduced below 2.03 me K+/l. Fruit ripened faster on plants receiving low concentrations of K. Maximum fruit yields were produced on plants grown in sand receiving 5.03 or 10.23 me K+/l.

The K content of fruit was closely correlated with the dry matter content, and for a given K treatment, the same equation described the uptake of K into the fruit of boty varieties. However, fruit trusses of cv. Moneymaker contained the most K, and this is attributed to their high dry matter content. The element was evenly distributed between and within trusses from normal and K-deficient plants of both varieties. More than ten times more K and five times more N and P was taken up into fruit of plants receiving 5.03 or 10.23 me K+/l. The K status of young fully expanded leaves associated with maximum dry weight production in 6-wk-old plants was 1.4±0.2 g K+/100 g dry weight in the whole leaf (1.1±0.1 in the laminae, 2.1±0.3 in the petioles). Maximum fruit yield without the production of excessive foliage was associated with 5.2±0.8 g K+/100 g dry weight in the whole leaf (3.8±0.6 and 8.1±1.1 in the laminae and petioles, respectively).


  1. T. Besfordand G. A. Maw, 1975. Effect of Potassium Nutrition on Tomato Plant Growth and Fruit” in Plant and Soil, Volume 42, pp 395-412

“Summer squash” (Cucurbita maxima var. zapallito (Carr.) Millán) is a monoecious species and the reproductive stage starts with female flowering. A male to female flower ratio lower than 10:1 results in greater fruit setting and yield. This relation is controlled by environmental factors, growth hormones, and nutrients. The aim of this study was to evaluate the effect of the N: K ratio of sex expression, fruit setting, earliness and yield on the summer squash. Before emergence 50 kg P ha -1 was applied, after that N and K were used to get the following relations: 50N:0K, 50N:50K, 50N:100K. The number of flowers was greater for the relations 50N:50K and 50N:100K than for 50N:0K. The increment in the K fertilization did not affect the number of male flowers but decreased the male to female flower ratio due to higher female flower production. The number of fruit set was lower at 50N:0K, without significant differences between 50N:50K and 50N:100K. The highest early yield was obtained with 50N:50K and 50N:100K, on 50N:0K. The highest marketable yield was achieved with 50N:100K because of a greater commercial fruit number since there was no significant fruit weight difference with fertilization:

De Grazia, Javier; Tittonell, Pablo; Perniola, Omar Salvador; Caruso, Ariel & Chiesa, Angel, 2003. “Summer Squash (Cucurbita maxima var. zapallito (Carr.) Millán) Earliness and Yield as Affected by the Nitrogen: Potassium Ratio”. Agricultura Tecnica, Volume 63, No4, pp 428-435

Eight cultivars of gladiolus namely Deciso, Hong Kong, Jessica, Jester  Ruffled, Madonna, Peters Pears, Rose Supreme and White Friendship were used to study the influence of potassium levels (0, 100 and 200kg K ha-1). All growth parameters except plants corm-1 studied during the experiment were significantly affected by the two experimental years. Plants emergence (Sprouting), spike emergence, first floret and full spike opening were earlier in the first year. Some plants corm-1 was more in the first year whereas plant height was higher in the second year (2004-05). Potassium levels significantly affected days to spike emergence and first florets opening. Spike appearance was earlier at 100kg ha-1 and first floret opening was delayed with an increase in potassium levels. Cultivars irrespective of years and potassium levels were significantly different in pre-flowering growth characteristics. Similarly years X cultivars interaction resulted in significant differences in pre-flowering growth characteristics.

Cultivars  X potassium interaction significantly influenced spike emergence and days to first florets opening. Days to spike emergence were significantly affected by an interaction among years, phosphorus levels, and cultivars. Rose Supreme andJessica and potassium@100kg are recommended for commercial cultivation of gladiolus.


Muhammad Zubair, Gohar Ayub, Faridullah Khan Wazir, Munir Khan and Zafar Mahmood, 2006. Effect of potassium on pre-flowering growth of gladiolus cultivars. Journal of Agricultural and Biological Science, Volume 1, Issue 3, pp 36-46.

Phosphorus plays a vital role in virtually every plant process that involves energy transfer.  High-energy phosphate, held as a part of the chemical structures of adenosine diphosphate (ADP) and adenosine triphosphate (ATP), is the source of energy that drives the huge number of chemical reactions within the plant. Without phosphorus, there is a decrease in the number of flowers. Cytokinins which are crucial growth hormones are also implicated in this pathway, and the amount of cytokinin activity decreases with a decrease in phosphorus amounts.

“When P is limiting, the most striking effects are a reduction in leaf expansion and leaf surface area, as well as the number of leaves. Shoot growth is more affected than root growth, which leads to a decrease in the shoot-root dry weight ratio. Nonetheless, root growth is also reduced by P deficiency, leading to less root mass to reach water and nutrients.”

Better Crops.  1999.  83(1)

Potassium Sulfate

A field experiment was conducted at Central Cotton Research Institute, Multan, Pakistan to study the effects of potassium nutrition on leaf area index in cotton (Gossypium hirsutum L.) The treatments consisted of four cotton cultivars (CIM-448, CIM-1100, Karishma, S-12), four potassium-rates (0, 62.5, 125.0, 250.0 kg K ha-1) and two sources of potassium fertilizer [potassium chloride (KCl), potassium sulphate (K2SO4)]. During the early part of the season, leaf area index progressed slowly and required 60 days to reach at 1.5 and then it reached at 4.02 within next 30 days. After that, it declined gradually to minimums of 0.62 at maturity. Cultivar CIM-1100 maintained the highest leaf area index compared to other cultivars. Leaf area index increased with concurrent increase in potassium levels. The regression analysis indicated a highly significant relationship (r = 0.94**) between potassium levels and leaf area index. The addition of potassium fertilizer in the form of potassium sulfate showed an edge over potassium chloride. There were highly significant (p<0.01) relationships between leaf area index and number of total fruit, number of bolls per plant, plant height, total dry weights and leaf dry weights:

  1. Pervez et. al. 2006. Influence of potassium nutrition on leaf area index in cotton (gossypium hirsutum l.) Under an arid environment. Pak. J. Bot., 38(4): 1085-1092

Magnesium Sulfate

In soilless culture systems, recycling the nutrient solution causes an accumulation of sulfate ions, which can generate nutrient imbalances affecting crop yield. This study determined the effects of four sulfate concentrations in the nutrient solution on growth, foliar mineral composition, physiology and yield of greenhouse tomatoes. Ten days after transplanting, young tomato plants (Lycopersicon esculentum Mill, cultivar ‘Trust’) grown in rock wool were subjected to four sulfate concentrations (S0 = 0, S1 = 5.2 (control), S2 = 10.4 and S4 = 20.8 mmol L−1) in the nutrient solution. The S0 reduced plant dry weight, photosynthetic rate, chlorophyll content, and the total number of fruits. The S0 treatment was associated with high concentrations of P, Ca and Mg, but low levels of S in the leaves. The maximum concentration of sulfates in the nutrient solution did not reduce shoot dry weight, photosynthesis, crop yield and fruit quality, although it decreased Mg, Ca and P content in the leaves. Consequently, tomato plants appeared prone to sulfate deficiency but tolerated sulfate concentrations up to 20.8 mmol l−1 in the nutrient solution with no apparent detrimental effects on yield and fruit quality over a short cropping period:


Javier Lopez, Nicolas Tremblay, Wim Voogt, Sylvain Dubé, André Gosselin,1996. Effects of varying sulfate concentrations on growth, physiology and yield of the greenhouse tomato. Scientia Horticulturae, Volume 67, Issues 3–4, Pages 207–217.

Magnesium is required in significant amounts as it is needed everywhere inside and outside plant cells. The reason plants are green is because of magnesium; this metal is at the center of every chlorophyll molecule, the green pigment in plants. Without the magnesium, the chlorophyll molecule falls apart, and light energy is not captured in photosynthesis. Thus plants cannot make their food and grow.

Magnesium also is involved where ever phosphorus is being used to transfer cellular energy; Mg stabilizes high-energy phosphates wherever they are being carried by molecules such as adenosine triphosphate (ATP), or guanosine triphosphate GTP.

In the entire range of iron supply used, low iron levels depressed the chlorophyll content in pea leaves, the depression being marked and statistically significant at 15, 30 and 45 days growth. (1978). Plant and Soil, 49, 343-353.

Studies of S deficiency, a problem in certain crops in Africa, have yielded inconclusive and incomplete information. There is little information on the S status of soil in the forest-savanna zone.

Field trials were carried out with maize (Zea mays L.) at six locations in the forest and savanna areas of western Nigeria. Sulfur was applied at 0, 7.5, 15.0, 30.0, and 60.0 kg S/ha. Significant yield increases were observed with rates of S application from 7.5 to 30 kg S/ha. The response was more distinctly evident in the savanna than in the forest zone. The silking percentage was enhanced and grain quality improved with S application. No significant residual effect of the applied S was observed in the savanna zone, which was probably due to heavy leaching of the applied S. On these soils S response was observed where the amount of extractable S, extracted with either KH2PO4, Ca(H2PO4)2, or NH4C2H3O2 was below 4 ppm S. There was no response to S when extractable S levels were equal to or greater than 8.5, 10.0, and 12.0 ppm when soils were extracted with Ca(H2PO4)2, NH4C2H30, and KH2PO4, respectively. The critical S level in the ear leaf was estimated at about 0.14% S. Although there was a strong correlation between % N and % S in the ear leaf, the N:S ratio was not related to critical S levels in plants:

  1. T. Kang and O. A. Osiname,1975. Sulfur Response of Maize in Western Nigeria. Agronomy Journal, Vol. 68 No. 2, p. 333-336.

Magnesium deficiency of Pinus resinosa, P. strobus and P. banksiana was studied in young forest plantations on light textured soils bordering the western and southwestern margins of the Adirondack province of New York. The most conspicuous symptom of deficiency was a bright yellow discoloration of the tips of the current season’s needles, appearing in the fall and affecting the upper part of the tree most strongly. When the deficiency was severe, the chlorosis was followed by the death of the needle tips or premature loss of foliage. Gross reductions in shoot growth and needle length occurred only under extreme deficiency or when lack of magnesium was accompanied by potassium deficiency.

In P. resinosa the appearance of deficiency symptoms was usually associated with magnesium contents less than .16% of the oven dry weight of mature first-year foliage; with less than about .13% symptoms were severe. Fertilization with magnesium sulfate at rates of 20 to 50 lbs. Mg/acre eliminated or reduced the symptoms after a lapse of at least a year.

Fertilization of deficient trees with magnesium sulfate resulted in increased height growth over a period of at least three years. In two instances this increase was shown to be additive to that due to potassium, without evidence of significant interaction:

Earl L. Stone, 1952.  Magnesium Deficiency of Some Northeastern Pines. Soil Science Society of America Journal, Vol. 17 No. 3, p. 297-300

Magnesium is an essential plant nutrient but magnesium deficiency occurs fairly widely in Europe and North America, especially on light soils. In Great Britain, this is known to be so for many horticultural crops, although information on deficiencies in agricultural crops is limited.Magnesium sulfate applied to the seedbed for potatoes increased yield in some but not all experiments on light soils, while in a few on both early and main crop potatoes it depressed yield.Deficiency symptoms often seen in cereals and sugar beet are usually transient, and in almost all experiments on these crops applying Mg has not increased yield. There is a well-established interaction between Mg and K, and high rates of the latter can intensify deficiency symptoms and reduce the Mg content of the crop. Field experiments strongly suggest that the induced Mg-deficiency from substantial rates of applied potash seldom reduces the yield of potatoes, cereals or sugar beet:

  1. R. J. Holmes, 1962. The magnesium requirements of arable crops. Journal of the Science of Food and Agriculture, Volume 13, Issue 11, pages 553–556.


Our Products are hand-mixed to ensure quality, and we’ve included top-quality ingredients to help maximize the genetic potential of your high-yield gardens. They will keep your garden growing strong from the early vegetative phase all the way to the end of flowering. Follow the instructions on the bottles or devise your feeding ratios based on your experience and the demands of your particular plants.


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