Combined Analysis to Characterize Yield Pattern of Greenhouse-grown Red Sweet Peppers

Abstract

<jats:p>Understanding the irregular yield pattern of greenhouse-grown sweet peppers (<jats:italic>Capsicum annuum</jats:italic> L.) has been a challenge to researchers and greenhouse producers. Experimental data from 4 years, each consisting of 26 production weeks, were used in a time series analysis, neural network (NN) modeling, and regression analysis. Time series analysis revealed that weekly yield was influenced by yields from the preceding 2 weeks (Yd_1 and Yd_2), cumulative light 2 and 4 weeks prior (L_2 and L_4), and average 24-h air temperature 5 weeks prior (T_5). Cumulative light (L) data were transformed into kL by dividing by 1000 for subsequent NN modeling and regression analysis. These five inputs were used to establish a NN model, which illustrated the positive influence of Yd_1, kL_4, and kL_2 and negative influence of Yd_2 and T_5. Again, these five inputs were used in a regression analysis illustrating the positive influence of Yd_1 and the negative influence of Yd_2. Each input was further modified to include its squared value before entering the regression, which resulted in significant inputs of Yd_1, Yd_1 squared, and Yd_2 squared. Among these three analyses, the most consistent parameters were Yd_1 and Yd_2, confirming that the irregular yield pattern of greenhouse-grown peppers is of a biological nature. Environmental factors kL_2, kL_4, and T_5 did not show a consistent effect on yield in all three analyses, indicating yield pattern is less influenced by growing environment.</jats:p>

Modeling Short-term Yield Changes in Sweet Pepper Based on Dry Matter Production and Fruit Growth

“…6, Table 3). As a result, fresh weight yields were accurately predicted, and this result was in agreements with those of previous reports (Al-Halimi and Moussa 2015;Lin and Hill 2008;Lin et al 2009;Verlinden et al 2005).…”

Study of fat compost from dairy industry wastewater as a new substrate for pepper (Capsicum annuum L.) crop

“…Like other vegetable crops, peppers (Capsicum annuum L.) can be cultivated on conventional substrates such as perlite, rockwool, sand, and other soilless systems, which have replaced the traditional crop grown in agricultural soil in the greenhouse (Zhai et al, 2009;Díaz-Pérez and Camacho-Ferre, 2010). Increasing awareness of the adverse economic and environmental impacts of conventional substrates has stimulated the interest in using organic wastes and agricultural by-products as substrates in soilless culture (Del Amor and Gómez-López, 2009;Lin et al, 2009). On the other hand, there has not been found evidence on the utilization of fat compost to provide organic amendment.…”

Hybrid Vigor Induced by Cross-breeding Enhances Canopy Photosynthesis and Fruit Yield of Japanese Sweet Pepper

“…8). In pepper, the cyclic pattern in the yield caused by the physiological abscission of flowers or fruit depends on not only the source strength (i.e., the photosynthetic efficiency of the plant canopy) but also on the sink strength of each competing sink organ (Marcelis., 1996;Marcelis et al, 1998;Marcelis et al, 2004;Wubs et al, 2009a;Wubs et al, 2009b;Lin and Frey, 2009). The more rapid recoveries from physiological abscission in the F 1 cultivars derives from the higher canopy photosynthetic rate (i.e., the source strength).…”