1. Test time and site

1.1 Time: 8th , April, 2012 – 10th, November, 2013.
1.2 Site: Sunqiao Modern Agricultural Park, Shanghai

2. Material and Method
2.1 Growing substrate: pine park and perlite, pH 7.06
2.2 Test fertilizers: SEEK Bamboo Powder Bio Organic Fertilizer (BBP No.3), SEEK Natural Organic Liquid (BBP No.12), Sheep Manure Organic Fertilizer, Slow Release NPK Fertilizer (20-20-20), Plant Growth Regulator Chemical.
2.3 Medicinal Herb: Dendrobium
2.4 Experimental Design
The test was divided into 3 different treatments, each conducted in triplicate on randomized blocks with an area of 60 m2 for each block
Treatment 1: Using SEEK Bamboo Powder Bio Organic Fertilizer (BBP No.3) as base fertilizer, 10 kg/60M2, repeat every 4 months; SEEK Natural Organic Liquid (BBP No.12) as foliar fertilizer, 50ML/60M2, repeat every 10 days.
Treatment 2: Sheep Manure Organic Fertilizer, 30kg/60M2, repeat every 3 months; Plant Growth Regulator Chemical, 60ML/60M2, repeat every 10 days.
Treatment 3: Slow Release NPK Fertilizer (20-20-20) 2.5 kg/60M2, repeat every 3 months; Plant Growth Regulator Chemical, 50ML/60M2, repeat every 15 days.

3. Results
3.1 different fertilizers effects on dendrobium growth (table 1)

Table 1

Treatment Seedling Survival Rate (%) Stem Length (cm) Stem diameter (cm) Polysaccharose (%) Yield per Ha. (kg)
1 97.5 1.5 3.8 36.4 4800
2 92.8 1.5 3.7 29.6 4725
3 93.5 1.7 3.5 25.4 5025

According to table 1, we can get that Dendrobium seedling survival rate in treatment 1 was significantly higher than 2 and 3. For treatment 2, we used sheep manure organic fertilizer as the base fertilizer, which carries lots of pathogens, it may lead to rotted roots and death. For treatment 3, dendrobium seedling is very vulnerable and sensitive to chemicals. High soil potential may be lethal to dendrobium seedling. Stem length of treatment 3 was longer than 1 and 2, while this is the function of NPK chemical fertilizer, stimulate the growth of plants. However stem diameter of treatment 1 was larger than 2 and 3, diameter of dendrobium may affect the nutrients content, so when we test polysaccharose, treatment 1 was higher than the other 2. Larger stem diameter of dendrobium instead of longer stem length results in higher price.

Figure 1. dendrobium with treatment 1

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Figure 2. dendrobium with treatment 2

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Figure 3. dendrobium with treatment 3

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3.2 Sensitive evaluation of Dendrobium (table 2)
Table 2

Treatment Sensitive evaluation
1 Strong grass fragrance, slightly sweet, sticky thick, no fiber residue taste
2 Slightly grass fragrance, little bit sour, slightly fiber residue taste
3 No fragrance at all, heavy sour taste, taste like fiber

3.3 Economic efficiency analysis (table 3)
Table 3

Treatment Yield Fresh Stem Price Output value Fertilizer cost Gross Profit (output value – fertilizer cost)
(kg/ha) (RMB/kg) (RMB/ha) (RMB/ha) (RMB/ha)
1 4800 600 2,880,000 30,000 2,850,000
2 4725 350 1,653,750 27,500 1,626,250
3 5025 200 1,005,000 15,000 990,000

Note: other costs, such as management, seedling, land rent, labor etc. are same for treatment 1, 2, 3. These costs are not concluded in table 3.

4. Conclusion
Dendrobium with treatment 1 had a better seedling survival rate than treatment 2 and 3, though average stem length were shorter than 2 and 3. The nutrients content of dendrobium are proportional to stem’s diameter, so treatment 1 is the best one. Dendrobium with organic fertilizers is more acceptable by customers than with chemicals, since it is used as a medicine herb, though the organic dendrobium has a much higher price than inorganic one.