-flower production, the low percentage of capsule-set is commonly observed when Oncsa. Gower Ramsey is used as the pollen parent in our previous pollination experiments. The causes of low fertility may be associated with abnormal meiosis in orchid hybrids. Meiotic
management issues include site preparation, soil health, soil moisture, and soil fertility. Our focus is on methods suitable for organic certification. Site preparation If the soil is not already in production, key objectives for site preparation include
, weediness creates a constant maintenance issue in nursery production and in the home landscape. Sterile cultivars will likely save money, save time, and reduce the use of pesticides by commercial growers and home gardeners. Fertility estimates of elite
typically have low fertility due to a reproductive barrier whereby three sets of chromosomes cannot be divided evenly during meiosis yielding unbalanced segregation of chromosomes. Seedless bananas ( Musa sp.), watermelons ( Citrullus lanatus ), and some
male sterility. This article aimed to study the spatiotemporal correlations between pollen morphology (ontogenesis) and fertility in natural male-sterile triploid L. lancifolium to provide helpful information about the mechanism responsible for male
impart more heat tolerance than actual drought tolerance ( Abraham et al., 2008 ; Su et al., 2007 ). Kentucky bluegrass is widely used in the transition zone and in the colder northern climates where optimum seeding rates, nitrogen fertility, and mowing
on male (pollen) fertility for Miscanthus sp. Miscanthus sp. have a base chromosome number of 19 and M. sinensis varieties and cultivars have been reported as diploid with 2 n = 2 x = 38 ( Rayburn et al., 2009 ). Hybridizations between species
through controlled studies, low fertility has not been eliminated as a contributor to low fruit set and poor fruit quality. Fertility problems (concluded from decreased berry set, drupelet set, and/or seed number) as well as reduced pollen quality have
critically dependent on cross-pollination ( Meader and Darrow, 1944 ), although some indications of self-fertility in rabbiteye have been noted ( Krewer and NeSmith, 2006 ). In breeding for improved cold-hardiness in rabbiteye blueberry types, we have
Greenhouse hydroponics and field experiments were conducted to determine how nitrogen (N) fertilizer treatments affect tomato (Lycopersicon esculentum Mill.) growth, yield, and partitioning of N in an effort to develop more sustainable fertilization strategies. In a hydroponics study, after 4 weeks in nitrate treatments, shoot dry weight was five times greater at 10.0 than at 0.2 mm nitrate. An exponential growth model was strongly correlated with tomato root growth at all but 0.2 mm nitrate and shoot growth in 10 mm nitrate. Root dry weight was only 15% of shoot biomass. In field studies with different population densities and N rates, height in the 4.2 plants/m2 was similar, but shoot weight was less than in the 3.2 plants/m2. At 12 weeks after planting, shoot fresh weight averaged 3.59 and 2.67 kg/plant in treatments with 3.2 and 4.2 plants/m2, respectively. In 1998, final tomato yield did not respond to N rate. In 1999, there was a substantial increase in fruit yield when plants were fertilized with 168 kg·ha-1 N but little change in yield with additional N. Nitrogen content of the leaves and the portion of N from applied fertilizer decreased as the plants grew, and as N was remobilized for fruit production. Both studies indicate that decreasing N as a way to reduce N loss to the environment would also reduce tomato growth.