Question: What is the chemical formula for the sulfate substance allowed in Organic farming?

Context paragraphs:
Organic farming: Organic farming is an alternative agricultural system which originated early in the 20th century in reaction to rapidly changing farming practices.  Organic farming continues to be developed by various organic agriculture organizations today.  It relies on fertilizers of organic origin such as compost manure, green manure, and bone meal and places emphasis on techniques such as crop rotation and companion planting.  Biological pest control, mixed cropping and the fostering of insect predators are encouraged.  In general, organic standards are designed to allow the use of naturally occurring substances while prohibiting or strictly limiting synthetic substances.  For instance, naturally occurring pesticides such as pyrethrin and rotenone are permitted, while synthetic fertilizers and pesticides are generally prohibited.  Synthetic substances that are allowed include, for example, copper sulfate, elemental sulfur and Ivermectin.  Genetically modified organisms, nanomaterials, human sewage sludge, plant growth regulators, hormones, and antibiotic use in livestock husbandry are prohibited.  Reasons for advocation of organic farming include real or perceived advantages in sustainability, openness, self-sufficiency, autonomy/independence, health, food security, and food safety, although the match between perception and reality is continually challenged.

Campigliaite: Campigliaite is a copper and manganese sulfate mineral with a chemical formula of CuMn(SO)(OH)·4HO.  It has a chemical formula and also a crystal structure similar to niedermayrite, with Cd(II) cation replacing by Mn(II).  The formation of campigliaite is related to the oxidation of sulfide minerals to form sulfate solutions with ilvaite associated with the presence of manganese.  Campigliaite is a rare secondary mineral formed when metallic sulfide skarn deposits are oxidized.  While there are several related associations, there is no abundant source for this mineral due to its rare process of formation.  Based on its crystallographic data and chemical formula, campigliaite is placed in the devillite group and considered the manganese analogue of devillite.  Campigliaite belongs to the copper oxysalt minerals as well followed by the subgroup M=M-T sheets.  The infinite sheet structures that campigliaite has are characterized by strongly bonded polyhedral sheets, which are linked in the third dimension by weaker hydrogen bonds.

Copper(I) sulfate: Copper(I) sulfate, also known as cuprous sulfate and dicopper sulfate, is the chemical compound with the chemical formula CuSO and a molar mass of 223.15 g mol.  It is an unstable compound as oxo-acids are generally unstable and is more commonly found in the CuSO state.  It is light green in color at room temperature and is water-soluble.  Due to the low-stability of the compound there are currently not many applications to date.

History of organic farming: Traditional farming (of many particular kinds in different eras and places) was the original type of agriculture, and has been practiced for thousands of years.  All traditional farming is now considered to be "organic farming" although at the time there were no known inorganic methods.  For example, forest gardening, a fully organic food production system which dates from prehistoric times, is thought to be the world's oldest and most resilient agroecosystem.  After the industrial revolution had introduced inorganic methods, most of which were not well developed and had serious side effects, an organic movement began in the 1940s as a reaction to agriculture's growing reliance on synthetic fertilizers and pesticides.  The history of this modern revival of organic farming dates back to the first half of the 20th century at a time when there was a growing reliance on these new synthetic, non-organic methods.

Index of organic food articles: This is a list of organic food topics.  Organic foods are foods that are produced using methods of organic farming – that do not involve modern synthetic inputs such as synthetic pesticides and chemical fertilizers.  Organic foods are also not processed using irradiation, industrial solvents, or chemical food additives.

Potassium alum: Potassium alum, potash alum, or potassium aluminum sulfate is a chemical compound: the potassium double sulfate of aluminium.  Its chemical formula is KAl(SO) and it is commonly found in its dodecahydrate form as KAl(SO)·12HO.  Alum is the common name for this chemical compound, given the nomenclature of potassium aluminum sulfate dodecahydrate.  It is commonly used in water purification, leather tanning, dyeing, fireproof textiles, and baking powder.  It also has cosmetic uses as a deodorant, as an aftershave treatment and as a styptic for minor bleeding from shaving.

Eliot Coleman: Eliot Coleman (born 1938) is an American farmer, author, agricultural researcher and educator, and proponent of organic farming.  His 1989 book, "The New Organic Grower", is important reading for organic farmers, especially market gardeners.  He served for two years as Executive Director of the International Federation of Organic Agriculture Movements (IFOAM), and was an advisor to the U.S. Department of Agriculture during its 1979–80 study, "Report and Recommendations on Organic Farming", a document that formed the basis for today's legislated National Organic Program (2002) in the U.S.

Organic food: Organic food is food produced by methods that comply with the standards of organic farming.  Standards vary worldwide, but organic farming in general features practices that strive to cycle resources, promote ecological balance, and conserve biodiversity.  Organizations regulating organic products may restrict the use of certain pesticides and fertilizers in farming.  In general, organic foods are also usually not processed using irradiation, industrial solvents or synthetic food additives.

Organic farming and biodiversity: The effect of organic farming has been a subject of interest for researchers.  Theory suggests that organic farming practices, which exclude the use of most synthetic pesticides and fertilizers, may be beneficial for biodiversity.  This is generally shown to be true for soils scaled to the area of cultivated land, where species abundance is, on average, 30% richer than that of conventional farms.  However, for crop yield-scaled land the effect of organic farming on biodiversity is highly debated due to the significantly lower yields compared to conventional farms.

Copper(II) sulfate: Copper(II) sulfate, also known as cupric sulfate, or copper sulphate, is the inorganic compound with the chemical formula CuSO(HO), where x can range from 0 to 5.  The pentahydrate (x = 5) is the most common form.  Older names for this compound include blue vitriol, bluestone, vitriol of copper, and Roman vitriol.

Supporting paragraphs: Organic farming Copper(II) sulfate
Answer: CuSO(HO)