During the fourth to sixth or seventh week of the bloom period, the plant s nutritional uptake continues to rise before eventually reaching a climax. During this time the ratios of nutrient assimilation change rapidly. biOpOnic Floral Boost works by enhancing the levels of phosphorous, potassium, magnesium and ammonical nitrogen needed for the profuse setting of flowers and fruit. The solution pH will fall during this stage, which allows greater assimilation of phosphates required for profuse fruit and flower production.