J. Alagarda

Tipburn Incidence on Chinese Cabbage (Brassica campestris L. ssp pekinensis rupr.) Cultivated Under Greenhouse and its Prevention by Application of a High Calcium Foliage Fertilizer

It has been studied the incidence of Tipburn on three varieties of Chinese cabbage (Hi-Mark, Nagaoka Spring A-1 and Price) under two growing systems (greenhouse with heating and cooling system and greenhouse without any climatical regulation) and the influence of applications of a high calcium foliage fertilizer on the incidence of this disease. The obtained results have been the following: Hi-Mark was the least Tipburn susceptible variety The incidence of Tipburn was the least under greenhouse with climatical regulation It has had a clear response to foliage fertilizer, stated as a lesser of Tipburn

Growth and nutrient absorption of Cape Gooseberry (Physalis Peruviana L.) in soilless culture

Cape gooseberry (Physalis peruviana L.) is a solanaceous plant. The growth and time-course of nutrient accumulation of the plant and its partitioning between roots, stems, leaves, and fruits were examined. The study was conducted analyzing two nutrient solutions in soilless culture under greenhouse conditions during two consecutive seasons. The macronutrient contents were analyzed. On average, the yield was 8.9 t·ha−1. Growth of the plant until 90 d after transplanting obeys an exponential function of time and the relative growth rate for this period was determined. Nitrogen (N) was the element that showed the highest concentration, corresponding to leaves (4.67%), followed by potassium (K) in stems (4.46%). The highest accumulations of N, phosphorous (P), calcium (Ca), and magnesium (Mg) were found in leaves and of K in the stems. Potassium showed the highest nutrient accumulation (29 g·plant−1) and the highest specific uptake rate.

Influence of Growing Media on Physiological Disorders Incidence in Oriental Radishes.

Some cultivar radishes of ‘Daikon’ or oriental radish (Raphanus sativus L. var. longipinnatus L.H. Bailey) have largely replaced in Spain the cultivation of turnips (Brassica napus L.). Market acceptance of these taproots can be affected by the incidence of various physiological disorders, such as the cracking, hollowness, malformation and the emission of secondary roots. We used two Korean cultivars, ‘Spring Favor’ and ‘Spring White’ in greenhouse cultivation in two production cycles, autumn-winter and spring season, in containers of 25 L filled with three substrates, perlite B12, coir dust and sand. In these experiments, designed according to a factorial program, we tried to establish the influence of cultivars, maturity stages and growing media on the incidence of mentioned physiological disorders, commercial production, taproot shape and size, and leaves dry weight. ‘Spring White’ was more susceptible to cracking and malformation than ‘Spring Favor’ while ‘Spring Favor’ showed a greater susceptibility to hollowness and secondary roots emission, ‘Spring White’ taproots were longer and less wide than ‘Spring Favor’. Over-maturity taproots did not influence on the hollowness and malformation. Among the three used substrates, perlite behaved worse in the incidence of almost all studied physiological disorders, while it seems that sand and coir dust did not adversely affect them. No many significant interactions were detected between cultivars x substrates.